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April 16, 2014

Search: The Binding Energy of Electrons?

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The Binding Energy of Electrons?
An X-ray photon of wavelength 0.954 nm strikes a surface. The emitted electron has a kinetic energy of 935 eV. What is the binding energy of the electron in kJ/mol? [KE =1/2 mv^2; 1 electron volt (eV) = 1.602 x 10^- 19 J]
Monday, November 26, 2012 at 4:02pm by Amy

physics
Brightness also refers to intensity, or # of photons, what determines the kinetic energy of the ejected electrons is frequencey, as each photon releases 1 electron, if the photon has enough energy to overcome the work function, the remaining energy is then transformed into the...
Saturday, December 5, 2009 at 2:33pm by ALan

chemistry
An experiment is set up in which a copper surface is irradiated with high-intensity photons with a wavelength of 15.0nm. Electrons ejected from the surface are found to have a velocity of .548% of c. What is the binding energy of copper's most weakly bound electrons? What is ...
Thursday, June 28, 2012 at 11:00pm by Anonymous

Physics
I'm sorry if it's a lot, but I want to make sure I didn't do any mistakes on this worksheet. Thanks!!1. If the mass of a Ne-20 atom is 19.9924 amu, calculate its binding energy. (I got 2.578 x 10^-11 Joules)2. If the mass of a Ca-40 atom is 39.9626 amu, calculate its binding ...
Thursday, May 8, 2008 at 9:41pm by Emily

Physics
I suggest you use the curve of binding energy. You can find it at http://www.chegg.com/homework-help/questions-and-answers/estimate-total-binding-energy-copper-estimatethe-energy-joules-needed-break-3-g-copper-pen-q565643 The binding energy of copper, relative to its separated...
Monday, May 6, 2013 at 6:58pm by drwls

chemistry
From the binding energy per mole, convert that to binding energy per electron (divide by avagradros number). Then, E=h*c/lambda and solve for lambda
Sunday, September 21, 2008 at 10:10pm by bobpursley

chemistry
what is the binding energy of an electron in a photosensitive metal (in kj/mol) if the minimum frequency of light that can eject electrons from the metal is 6.3 x 20^14 Hz?
Monday, November 7, 2011 at 4:40pm by jj

The Binding Energy of Electrons?
Energy of photon: E = hc/λ h = Planck’s constant = 6.626•10⁻³⁴ J•s = 4.14•10⁻¹⁵ eV•s c = speed of light = 3•10⁸ m/s λ = wavelength = 0.954 nm = 0.954•10⁻⁹m E = 4.14•10⁻¹⁵•3•10⁸ / 0.954•10&#...
Monday, November 26, 2012 at 4:02pm by Elena

Chemistry
N2 has pi2py pi2pz and sigma2p filled. The two electrons in sigma 2p are at a higher energy level than the pi bonds. No antibonding electrons are present in the 2p orbitals. The bond order is 3 since that is 6 electrons/2 = 3. The two sigma 2p electrons occupy the highest ...
Tuesday, December 4, 2007 at 1:58pm by DrBob222

science
20 neutrons and 20 protons (with electrons) separately would have a mass of 40.328 amu As a Ca atom with electrons, the mass is 39.975 amu The mass difference (binding energy) of 0.353 amu (after converting to kg) can be converted to Joules using E = m c^2, OR if you want it ...
Monday, April 25, 2011 at 7:46am by drwls

Physics
To get binding energy in MeV, use the formula at this website: http://library.thinkquest.org/17940/texts/binding_energy/binding_energy.html There are 1.602*10^-12 J per eV, or 1.602*10^-6 J per MeV For the binding energy of He-4, divide the binding energy of He-4 by the number...
Thursday, May 8, 2008 at 9:41pm by drwls

Light Energy Problems
The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal. ----------------- The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt 6.80 g of ice.
Tuesday, November 27, 2012 at 6:31pm by Amy

Chemistry (Electrons in Atoms)
True or False. 1)Electrons give off light as they drop to lower energy levels. 2)Electrons travel around the nucleus as waves. 3)A photon of low frequency light has more energy than a photon of high frequency light. 4)Orbitals with equal energy levels each contain one electron...
Sunday, May 22, 2011 at 3:14pm by Jennie

chem
i am also having trouble iwth this one The atomic masses of barium-137, nitrogen-14, and titanium-48 are 136.905821 amu, 14.003074 amu, and 47.947947 amu, respectively. For each isotope, calculate the nuclear mass, the nuclear binding energy, and the nuclear binding energy per...
Tuesday, September 11, 2012 at 10:17am by hannah

chemistry
1 amu is equal to one-twelfth of the mass of a carbon-12 atom, including its electrons. It is slightly less than the mass of a free neutron or a free proton. A free electron has a mass of 1/1823 amu. The mass of an atom is always less than the sum of the masses of its separate...
Thursday, September 25, 2008 at 7:27am by drwls

Chemistry
An electron jumps from energy level 1 to energy level 2 by absorbing a photon of energy 8 eV. What is the most likely energy of the photon that will be emitted by the electron when it moves back down to energy level 1? 2 ev 4 ev 8 ev 12 ev What is the best description of the ...
Thursday, October 31, 2013 at 1:17am by bigurl1.4

Chemistry
24. A quantum is a finite amount of energy gained or lost by an atom.- F? 25. An atom is in an excited state when it has its lowest energy.- F 26. The Bohr model of the atom shows electrons in areas called energy levels.- F? 27. The principal quantum number indicates the main ...
Thursday, October 21, 2010 at 3:14pm by mysterychicken

Chemistry
what is the primary result of a fisson reaction ? 1 conversion of mass to energy 2 conversion of energy to mass 3 binding together of two heavy nuclei 4 binding together of two heavy nuclei i think its 4, am i right ?
Thursday, May 5, 2011 at 6:21pm by Jazmin

Chemistry
Calculate the mass defect and the binding energy/nucleon of the nuclide 9/4 Be, which has a mass of 9.01218224 amu. The mass of the proton is 1.00726747 amu and the mass of the neutron is 1.00866490 amu. I've gotten this far... mass of proton + mass of nuetron = 2.01594137. ...
Tuesday, June 8, 2010 at 12:47pm by Anonymous

science(chem)
Calculate the binding energy per nucleon for the following nuclei: a: 12C(nuclear mass, 11.996708 amu) 6 ------- b. ^37Cl(nuclear mass, 36.956576) i'm confused on how to solve and if theres a specific formula for this... please help thank you add the masses for six pronons, ...
Tuesday, January 9, 2007 at 6:49pm by Jina

chemistry
I'm not sure where the question is going but electrons are electrons. I don't see any difference in the electrons in any gas from electrons in any other gas. The electrons may be at difference energy levels which may lead to different colors from different excitation states.
Wednesday, February 10, 2010 at 8:42pm by DrBob222

Chemistry
Last ones: 32. There could be eight electrons in the first energy level.- F? 33. The first energy level can have only one sublevel.- F? 34. When electrons move from a high energy excited state to a low energy ground state, energy is absorbed by the atom.- F? 35. An atom that ...
Thursday, October 21, 2010 at 3:28pm by mysterychicken

Physics - Electricity
Can you please check my answers. 1) What carries energy through wire? electrons 2) What happens to some of the energy when it moves through the wire? becomes lost due to the movement of energy requiring some kinetic energy 3) If a resistance is large, why does the wire heat up...
Saturday, November 24, 2007 at 10:44pm by xX_Supaman_Xx

Physics
there is a small difference due to binding energy. E = m c^2, to get energy, you must lose mass.
Friday, April 25, 2008 at 8:11pm by Damon

Physics
How do I find the binding energy for the nuclei of Lithium 6. The equation I'm using is : B(N,Z)=Z*m(0,1)*c^2+N*(mass of n)*c^2-m(N,Z)*c^2. B(N,Z)=3*(1.00783u*1.66E-27kg)*(3E8 m/s)^2+3*(1.008664u*1.66E-27kg)*(3E8 m/s)^2-(6.015u**1.66E-27kg)*(3E8 m/s)^2 B(N,Z)= 4.84056E-12 J *6...
Saturday, November 26, 2011 at 3:02am by Sarah

chem 101
. In an electron microscope the electrons generate the image. For one of the scanning electron microscopes in our Central Analytical Facility, the electrons are accelerated to have a kinetic energy of 200,000 eV. Electrons with this kinetic energy have a velocity of 2.67 x 10^...
Friday, April 13, 2012 at 2:32pm by Anonymous

Chemistry
why does inoinzation energy tend to decrease from top to bottom within a group? i'm not sure, but i think it has something to do with the size of the element The electrons involved in ionization, that is, the outermost electrons, are farther away from the nucleus, and are held...
Tuesday, October 31, 2006 at 7:58pm by Mark

physics
Which of the following summarizes Rutherford's model of the atom? Choose one answer. a. Electrons are embedded in a positive region of spherical dimension. b. Electrons revolve around the nucleus without emitting radiation. c. Electrons revolve around the nucleus like planets ...
Sunday, May 1, 2011 at 3:35pm by ashley --- HELP PLEASEE!!!

physical science
how is an electron related to atomic mass? Electrons are less than 1/1000 of the mass of an atom. When atomic mass is measured, it includes the small mass of the electrons. how is an isotope related to mass number ? I believe I answered that question already, in response to ...
Sunday, November 4, 2007 at 1:33am by drwls

chem 101
In an electron microscope the electrons generate the image. For one of the scanning electron microscopes in our Central Analytical Facility, the electrons are accelerated to have a kinetic energy of 200,000 eV. Electrons with this kinetic energy have a velocity of 2.67 x 10^8 ...
Sunday, April 15, 2012 at 2:01pm by Anonymous

Chemistry
In the recent Chem Activities, we have been learning about how Coulombic attractions and repulsions determine properties of atoms like ionization energy and atomic radius. We have made two assumptions not completely justified by the data we had up to this point: electrons are ...
Monday, September 26, 2011 at 4:45pm by Caitlin

Physical Science
Need help with these questions- 1.What causes an electric current in a wire? A.Electric feilds cause atoms to move in the wire B.Electrons flow because of electrical attraction and repulsion C.Electrons move because of heat D.Electrons build up in the wire and create a charge ...
Monday, May 11, 2009 at 10:41am by mysterychicken

Chemistry
The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal. ----------------- The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt 6.80 g of ice.
Wednesday, November 28, 2012 at 8:07pm by James

Chemistry
Which statement concerning the electrons surrounding the nucleus of an atom is NOT correct? a) When 2 electrons pair together, they have opposite spins. b) The number of the electrons in an isolated neural atom is equal to the atomic number c) The second main energy level can ...
Thursday, September 27, 2012 at 11:36am by Peter

chemistry
metals have lots of free or lose electrons that allows the energy to move freely while insulators electrons are tightly bound and don't allow for lots of energy movement
Monday, December 19, 2011 at 7:05pm by Jacob

chemistry
Why do you think that the ionization energy tends to decrease within a family of the periodic table? Since ionization energy tends to increase within a period of the periodic table because they are in higher energy orbitals so it'll take more energy to remove the electrons. It...
Sunday, April 19, 2009 at 11:51pm by sh

biology
Sulfur has six electrons in its outer most energy level. In ionic bonding, it would tend to ­­­­­­­­­_____________________________. A. take on two more electrons B. give away two electrons C. give away six electrons D. not take on anymore electrons
Tuesday, November 5, 2013 at 7:37pm by hannah

biology
Sulfur has six electrons in its outer most energy level. In ionic bonding, it would tend to ­­­­­­­­­_____________________________. A. take on two more electrons B. give away two electrons C. give away six electrons D. not take on anymore electrons
Wednesday, November 6, 2013 at 3:42pm by hannah

Chemistry
is this a good answer? When the electrons in the element are excited they jump to higher energy level and as the electrons fall back down it leave the excited state energy which is re-emitted, the wavelength of which is the emission spectrum.
Tuesday, November 6, 2007 at 9:25pm by John

chemistry
Valence electrons are easier to remove (ionize) than electrons in the shell under the valence shell. A complete shell, closer to the nucleus is more difficult to disturb. After the valence electrons are removed, removal of an electron from the shell below requires much more ...
Monday, December 14, 2009 at 4:15pm by GK

Chemistry - is this correct?
Write the electronic configuration for nickel(#28). I know it is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8 (b) How many electrons are there of highest energy in nickel? Is it 8? (c) how many electrons are there in the outermost energy level(orbit) of nickel? Is this 8 also?
Monday, October 28, 2013 at 9:43pm by Anonymous

general chemistry
An X-ray photon of wavelength 0.948nm strikes a surface. The emitted electron has a kinetic energy of 979 eV. What is the binding energy of the electron in Kjol/mol ?
Sunday, February 13, 2011 at 10:00pm by soso

inorganic chermistry
They are different because electrons are falling from different energy levels back to "different" energy levels. Why must they be heated. The electrons must have the energy to move to higher levels.
Friday, October 1, 2010 at 3:03pm by DrBob222

chemistry
For each, give the total number of electrons, the number of valence electrons, and the number of the energy level that holds the valence electrons. Br-35 electrons--7 valence--4th level Kr-36 electrons--8 valence--4th level As-33 electrons--5 valence--4th level I-53 electrons...
Sunday, February 5, 2012 at 1:20pm by kr

physical science
Bob Pursley has given you the correct definition of an atomic mass unit. The atomic mass of a particular isotope is very close to an integer that equals the total number of protons and neutrons in the nucleus. There are differences between the actual value and an integer that ...
Sunday, November 4, 2007 at 9:04pm by drwls

AP chem
It takes 208.4 kJ of energy to remove 1 mole of electrons from atom on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom ont eh surface of solid rubidum? What is teh maximum wavelength of light capable of doing this? If 208.4 ...
Sunday, October 1, 2006 at 7:25pm by beth

Chemistry - is this correct?
Your electron configuration is right. b) Yes, there are 8 electrons in the highest energy sublevel. c) For part c I think it would be 10 because when you look at the last orbit, it includes both s-block and d-blocks. So when you include the electrons from 4s^2 and 3d^8, there ...
Monday, October 28, 2013 at 9:43pm by Serena

chem
Nuclear binding energy= c^2 * mass defect
Sunday, December 7, 2008 at 5:17pm by bobpursley

physics
please check these: Which interaction of nature binds atoms and molecules by attracting unlike charges and repulsing like charges? a. strong b. weak c. electromagnetic d. gravitational i got A, but someone said C , so i just want to make sure How is a motor's mechanical energy...
Saturday, March 14, 2009 at 10:57am by physics

Chemistry
It takes 208.4 kJ of energy to remove one mol of electrons from the atoms on the surface of rubidium metal. If rubidium metal metal is irradiated with 254-nm light, what is the maximum kinetic energy the released electrons can have?
Tuesday, January 24, 2012 at 11:28pm by Kaleen

chemistry
I have two Questions I need help with. 1. Why do some combinations of ionic compounds form a precipitate while other ionic compounds don't? AND 2. Solutions of lead(II)nitrate and potassium iodide are combined in a test tube and form a yellow precipitate. What is the molecular...
Monday, December 4, 2006 at 9:40am by cbarnett

Science
How do I determine the amount of electrons in highest occupied energy level? Thanks The elements in Carbon-12, Atomic Number =6, Neutron 6, Electron=6, and Proton= 6. How would I find the electrons in highest occupied energy level?
Tuesday, September 13, 2011 at 5:43pm by Shadow

science
I'm sure you know about energy levels for electrons in atoms. If you confine a particle in a box then, just like in case of electrons in atoms, there will be energy levels that that particle can occupy. The smaller the box is, the higher the lowest possible energy level will ...
Saturday, September 1, 2007 at 8:12pm by Count Iblis

Chemistry
You have a lousy text set of questions. Just plain awful. 7. Generally, true. 17. I have no idea what that means. When mass is formed, it came from energy. Nuclear binding energy is stored energy in the form of mass. When some of that mass is lost, energy is given off. Mass is...
Thursday, October 28, 2010 at 9:14pm by bobpursley

chem
how is nuclear binding energy related to the mass defect?
Sunday, December 7, 2008 at 5:17pm by melissa

Chemistry
if the atom gains energy, the electrons have energy to release, and often they do. Unstable, if you are speaking of energy stored in the electron orbitals.
Wednesday, November 9, 2011 at 3:56pm by bobpursley

Biology
These are true and false questions and I want to be sure of my answers. Please someone check. Thanks: The eight-element periodicity found in the Periodic Table is related to the number of electrons in the outermost energy level of the atoms that make up each element. True 2. ...
Saturday, September 3, 2011 at 1:37am by Cad

Biology
These are true and false questions and I want to be sure of my answers. Please someone check. Thanks: The eight-element periodicity found in the Periodic Table is related to the number of electrons in the outermost energy level of the atoms that make up each element. True 2. ...
Saturday, September 3, 2011 at 2:15pm by Cad

Science/Chemistry
How many electrons can occupy a single molecular orbital? and Alumimum is a group 3A metal, Which ion does A1 typically form? I'm thinking Al3+ Your first question depends on the molecule involved and how it is bonded. Hybrid molecular orbits can be formed. Now in an atom, ...
Wednesday, January 10, 2007 at 6:30am by Devon

Physics
-Estimate the total binding energy for copper? in MeV -Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons? E= in Joulea Please help me I am confused...thanks
Monday, May 6, 2013 at 6:58pm by Leila

Chemisdtry - Lewis Structures (check + help)
C has 4 electrons, O has 6 electrons + -2 charge adds 2 more electrons 4 + (3 * 6) + 2 = 24 electrons 4 atoms * 8 electrons per atom = 32 electrons 32 – 24 = 8 electrons 8 electrons ÷ 2 electrons per bond = 4 bonds 24 – 8 = 16 electrons 16 electrons = 8 pairs of non-bonding ...
Sunday, February 13, 2011 at 6:32pm by Annon

Physics
Calculate (in MeV ) the total binding energy for 40 Ca.
Sunday, December 4, 2011 at 10:44pm by Paige

Physics
Calculate (in MeV ) the total binding energy for 40 Ca.
Sunday, December 4, 2011 at 10:44pm by Paige

Chem
I was asked to fraw the energy level diagram for carbon. Carbon has 6 electrons so would the 2s and 2p orbitals both be half full? 1s = 2 electrons 2s= 1 electron 2p = 3 electrons
Tuesday, July 7, 2009 at 3:11pm by Lena

chemistry
Lithium-6 has an atomic number of 3. How many electrons are in this isotope? A. 0 electrons B. 3 electrons C. 6 electrons D. 9 electrons I think C. 6
Monday, November 19, 2012 at 10:38pm by drew

physics
The physics of energy and Earth's moon as a satellite. The moon is an Earth satellite of mass 7.35 x 10^22 kg, whose average distance from the centre of Earth is 3.85 x 10^8 m. a) What is the gravitational potential energy of the moon with respect to Earth? b) What is the ...
Sunday, April 24, 2011 at 8:43pm by aly

physics
Part C Calculate (in MeV ) the total binding energy for 40 Ca .
Monday, December 5, 2011 at 12:37pm by paige

phyics
Calculate (in MeV ) the binding energy per nucleon for 40 Ca .
Monday, December 5, 2011 at 12:38pm by paige

Physical Science
ok so i keep getting one wrong on a 4 question test and failing so can someone tell me what im getting wrong 1. What causes an electric current in a wire? A. Electric fields cause atoms to move in the wire. B. Electrons flow because of electrical attraction and repulsion. C. ...
Friday, March 1, 2013 at 5:03pm by s

Economics
The price received by sellers in a market will decrease if the government Answer A. imposes a binding price floor in that market. B. decreases a binding price ceiling in that market. C. decreases a tax on the good sold in that market. D. increases a binding price floor in that...
Tuesday, November 29, 2011 at 12:01pm by Will

Chemistry
The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, ν0. Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.48 × 1014 s–1. With what kinetic energy will electrons be ejected ...
Sunday, March 24, 2013 at 10:57pm by marie darling

boooring chemistry!!:(
Halogens are non-metals and if observed they form ionic bonds with metal because halogens have a high ionization energy to attract the metals. if you don't know what ionization energy is it means the energy need to to remove the electrons from an atom. Halogens also form ...
Tuesday, June 21, 2011 at 7:02pm by molly

chem
If you are talking about flame emissions (and not visible colors as we look at them), the answer is that the electrons in the elements are raised to various energy levels and they fall back to their original positions, either all at once or in steps. Different elements have ...
Wednesday, October 6, 2010 at 4:51pm by DrBob222

Chemistry
According to Hund's rule,electrons occupy equal energy orbitals so that a maximum number of UNPAIRED electrons results. True or False
Wednesday, October 10, 2012 at 11:19pm by Anonymous

Economics
Which of the following would not interfere with market equilibria? A. a minimum wage B. a rent control C. a non-binding price floor D. a binding price ceiling
Tuesday, November 29, 2011 at 12:02pm by Will

Chemistry
A neutral atom of an element has 2 electrons with n=1, 8 electrons with n=2, and 5 electrons with n=3. Write its electron configuration and find: A) atomic number B) total number of s electrons C) total number p electrons D) total number of protons E)Paired electrons F)...
Monday, February 24, 2014 at 10:00pm by Taylor Beach

CHEMISTRY
Ionization is when an electron is removed from an atom and ionization energy is the energy required to do this. "Electrons stream from the negative electrode to the positive electrode. In the process of moving from one electrode to the other they knock electrons in the ...
Sunday, November 13, 2011 at 6:08pm by Jessica

Physics 2
A particle moves along a line where the potential energy of its system depends on its position r as graphed in Figure P8.46. In the limit as r increases without bound, U(r) approaches +1 J. (a) Identify each equilibrium position for this particle. Indicate whether each is a ...
Thursday, October 20, 2011 at 9:01pm by Anonymous

chemistry
It isn't clear what you mean by the third level. There are two s electrons, 6 p electrons, 10 d electrons and 14 f electrons. Fit those into any scheme and add them up and you will get the number of electrons at that level. 2N^2 will give you the maximum number of electrons in...
Monday, November 9, 2009 at 8:04am by DrBob222

Chemistry #13
When a metal was exposed to light at a frequency of 4.26× 1015 s–1, electrons were emitted with a kinetic energy of 4.50× 10–19 J. What is the maximum number of electrons that could be ejected from this metal by a burst of light (at some other frequency) with a total energy of...
Wednesday, November 6, 2013 at 11:01pm by Chelsea

Chemistry Please :/
When a metal was exposed to light at a frequency of 4.26× 1015 s–1, electrons were emitted with a kinetic energy of 4.50× 10–19 J. What is the maximum number of electrons that could be ejected from this metal by a burst of light (at some other frequency) with a total energy of...
Thursday, November 7, 2013 at 12:21am by Chelsea

Physics
Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks
Tuesday, May 7, 2013 at 9:49pm by Leila

chemistry
It much prefers to add two electrons over removing one electron. The removal of an electron must expend energy to remove a negatively charged electron from the positively charged nucleus. Adding two electrons actually gives up energy because the outside shell is being filled.
Sunday, September 19, 2010 at 1:19pm by DrBob222

biology
this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions: 3 low energy electrons at PSI are re-energized by a photon of light 5 electrons energized at PSII jump to a higher lever, as they fall through various ...
Saturday, March 22, 2008 at 11:14pm by I NEED Biology help

Science
The binding energy of 20 10 Ne is 161 MeV. Find its atomic mass.
Sunday, October 2, 2011 at 6:52pm by Sheryl

English
Which of the following would be an example of an emotional appeal that is part of a persuasive message? A. Written agreement are binding. B. There is reliance on nonverbal signs to communicate. C. Oral agreements are not binding. D. There is a preference for direct communication.
Wednesday, October 5, 2011 at 2:44pm by Donna

12 Biology! URGENT!
Is this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions: 3 low energy electrons at PSI are re-energized by a photon of light 5 electrons energized at PSII jump to a higher lever, as they fall through various ...
Saturday, March 22, 2008 at 4:27pm by Photosynthesis

12 Biology! URGENT!
Is this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions: 3 low energy electrons at PSI are re-energized by a photon of light 5 electrons energized at PSII jump to a higher lever, as they fall through various ...
Saturday, March 22, 2008 at 6:08pm by Photosynthesis

Chem
You should have 8 electrons around each F. That uses 40 electrons (8*5=40) and if you count the electrons around I there are 10. But you have 42 electrons total (6 atoms of 7 electrons each = 42); therefore, you must place 2 more electrons on I to make 12 electrons on I and 8 ...
Wednesday, July 8, 2009 at 9:58pm by DrBob222

Chemistry (Follow up post - Dr.BOB22)
Ionization is when an electron is removed from an atom and ionization energy is the energy required to do this. "Electrons stream from the negative electrode to the positive electrode. In the process of moving from one electrode to the other they knock electrons in the ...
Sunday, November 13, 2011 at 9:39pm by Jessica

Chemistry Help
OK. Now that you've described it a little better, this is how I would go. The << in 4s can't be because of the Pauli Exclusion Principle (No two electrons can have the same 4 quantum numbers). The 3d should fill before the 4s; that's the Aufbau Principle (electrons fill ...
Sunday, November 21, 2010 at 3:13pm by DrBob222

Physics
Lithium is the atom which has three protons in its nucleus and three electrons circling the nucleus.(it usuallly has 3 nuetrons as well,but they r not important in this problem.)Two of the electrons circle the nucleus at a distance 1.8* 10^-11 m (app.)The third electron is ...
Thursday, February 7, 2008 at 8:44pm by jenish

Chemistry
What is the binding energy of 1 mole of 239/94 Pu if the mass defect is 0.001896 kg/mol?
Friday, September 20, 2013 at 12:57pm by Abbie

Chemisrty
Why does ionization energy tend to increase as you move across a period? As you move across a period, you add a proton in the nucleus and an electron in the outer shell. Ther greater number of protons causes a stronger pull on the electrons. The electrons are held tighter, ...
Tuesday, October 31, 2006 at 9:40pm by Bryan

Chemistry
No. The electron emitting the 5.2E-9 (meters?) must have been moved from the ground state to an upper energy level. So the proton must have had that minimum energy. However, I notice on re-reading the question that it speaks of FREE electrons. Perhaps I'm not on the same "...
Sunday, October 13, 2013 at 4:44am by DrBob222

physics
In the photoelectric effect, does brightness or frequency determine the Kinetic energy of the ejected electrons? Which determines the number of the ejected electrons?
Saturday, December 5, 2009 at 2:33pm by coach

Chemistry
An atom contains a total of 25 electrons. When the atom is in the ground state, how many different principal energy levels will contain electrons? a. 1 b. 2 c. 3 d. 4 I really don't get this because I thought energy levels went like 2, 8, 18, 32, and 50, but 25 is between 18 ...
Friday, October 15, 2010 at 8:22pm by timmy123

CHEM
So binding energy in your problem IS the same as work function which is the assumption I made in my first post. I've not heard it called that.
Monday, November 5, 2007 at 10:14pm by DrBob222

chemistry
What are the reactants and products? I don't see any arrow representing a process. What do the +(g) and -(g) represent? You must have made some typing errors. Is RbBr gas being formed from gaseous Rb and Br? That energy release would equal the Rb-Br electrostatic bond binding ...
Friday, December 7, 2007 at 11:35am by drwls

Chemistry
1. What is the total number of principal energy levels or shells in an atom with an atomic number of 30? a. 3 b. 4 c. 5 d. 6 I choose b. Correct. 2. The electron configuration of an atom in the ground state is 2-4. The total number of occupied principal energy levels in this ...
Saturday, October 16, 2010 at 3:47pm by DrBob222

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