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September 18, 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]
November 26, 2012 by Amy

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 ...
June 28, 2012 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 ...
May 8, 2008 by Emily

chemistry
Which of following statements correctly describes energy levels? A. Electrons can never move to a higher or lower energy level. B.In it's outermost energy level, oxygen has 4 valence electrons. C. The second energy level holds a maximum of eight electrons. D. The greater the ...
August 23, 2014 by Yui

chemistry
Which of the following statements correctly describes energy levels? A. Electrons can never move to a higher or lower energy level. B. In its outermost energy level, oxygen has 4 valence electrons C. The second energy level holds a maximum of eight electrons. D. The greater ...
September 2, 2014 by Emiko

chemistry
which of the following statements correctly describes energy levels? A. Electrons can never move to a higher or lower energy level. B. In its outermost energy level, oxygen has 4 valence electrons C. The Second energy level holds a maximum of eight electrons. D. The greater ...
September 6, 2014 by Hideko

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?
November 7, 2011 by jj

chemistry
1. What is the binding energy per nucleon? Why is the binding energy per nucleon, rather than per nuclide, used to compare nuclide stability? 2. When a nucleus forms from nucleons, is energy absorbed or released? Why? 3. Many scientists reacted skeptically to Einstein's ...
July 26, 2014 by Annie

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 = 6.78ื10^−6 m that must be absorbed to melt 6.80 g of ice.
November 27, 2012 by Amy

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 ...
October 31, 2013 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 ...
October 21, 2010 by mysterychicken

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...
May 22, 2011 by Jennie

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, ...
January 9, 2007 by Jina

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 ...
October 21, 2010 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 ?
May 5, 2011 by Jazmin

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^...
April 13, 2012 by Anonymous

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...
November 24, 2007 by xX_Supaman_Xx

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 = 6.78ื10^−6 m that must be absorbed to melt 6.80 g of ice.
November 28, 2012 by James

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. ...
June 8, 2010 by Anonymous

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 ...
April 15, 2012 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 ...
September 26, 2011 by Caitlin

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 ...
May 1, 2011 by ashley --- HELP PLEASEE!!!

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...
November 26, 2011 by Sarah

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 ...
September 27, 2012 by Peter

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...
October 31, 2006 by Mark

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 ...
May 11, 2009 by mysterychicken

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

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

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
July 7, 2009 by Lena

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 ...
October 1, 2006 by beth

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...
April 19, 2009 by sh

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?
October 28, 2013 by Anonymous

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, ...
January 10, 2007 by Devon

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...
December 4, 2006 by cbarnett

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 ...
October 15, 2010 by timmy123

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 ?
February 13, 2011 by soso

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?
January 24, 2012 by Kaleen

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...
March 14, 2009 by physics

Physics
Calculate (in MeV ) the total binding energy for 40 Ca.
December 4, 2011 by Paige

Physics
Calculate (in MeV ) the total binding energy for 40 Ca.
December 4, 2011 by Paige

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?
September 13, 2011 by Shadow

Chemistry #13
When a metal was exposed to light at a frequency of 4.26ื 1015 s–1, electrons were emitted with a kinetic energy of 4.50ื 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...
November 6, 2013 by Chelsea

Chemistry Please :/
When a metal was exposed to light at a frequency of 4.26ื 1015 s–1, electrons were emitted with a kinetic energy of 4.50ื 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...
November 7, 2013 by Chelsea

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. ...
September 3, 2011 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. ...
September 3, 2011 by Cad

chemistry
boron-10 has an atomic number of 5. how many electrons are in this isotope? 0 electrons, 2 electrons, 5 electrons, 10 electrons. I think 10
November 19, 2012 by drew

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
November 19, 2012 by drew

chem
how is nuclear binding energy related to the mass defect?
December 7, 2008 by melissa

physics
Part C Calculate (in MeV ) the total binding energy for 40 Ca .
December 5, 2011 by paige

phyics
Calculate (in MeV ) the binding energy per nucleon for 40 Ca .
December 5, 2011 by paige

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 ...
February 7, 2008 by jenish

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 ...
March 24, 2013 by marie darling

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)...
February 24, 2014 by Taylor Beach

Science
The binding energy of 20 10 Ne is 161 MeV. Find its atomic mass.
October 2, 2011 by Sheryl

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

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
May 6, 2013 by Leila

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. ...
March 1, 2013 by s

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

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 ...
March 22, 2008 by I NEED Biology help

chemistry
Which statement correctly describes an atom of the element helium? A. An atom of helium has its valence electrons in it's first energy level. B. An atom of helium most similarly behaves like an atom of hydrogen since it is in the same period. C. An atom of helium has a full ...
August 23, 2014 by Yui

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...
November 29, 2011 by Will

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...
February 5, 2012 by kr

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
November 29, 2011 by Will

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 ...
April 24, 2011 by aly

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 ...
March 22, 2008 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 ...
March 22, 2008 by Photosynthesis

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.
October 5, 2011 by Donna

physics
in an electron microscope, a tungstun cathode with work function 4.5 eV is heated to release electrons that are then initially at rest just outside the cathode. The electrons are accelerated by a potential difference to create a beam of electrons with a de Broglie wavelength ...
June 9, 2008 by shelly

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 ...
November 13, 2011 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 ...
October 20, 2011 by Anonymous

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, ...
October 31, 2006 by Bryan

Biology
Which materials produce during the light reactions of photosynthesis are essential to the dark reactions? Light Reactions (Occurs in Grana) The purpose of the light reactions is to change light energy into chemical energy of ATP and NADPH. a) Require light b) Light makes ...
February 19, 2007 by Sara

Chem
How would a Lewis Dot Structure be drawn for CO +1? I can't seem to get it to satisfy the octet rule and have the right number of electrons. How many electrons do you have? 1C = 1 x 4 = 4 electrons. 1O = 1 x 6 = 6 electrons. Total is 10 electrons. -1 electron because you have ...
December 5, 2006 by Alyssa

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?
December 5, 2009 by coach

Chemistry
An atom contains a total of 29 electrons. When the atom is in the ground state how many principle energy levels will contain electrons? a: 1 b: 2 c: 3 d: 4 How do you figure this out?
October 9, 2010 by danny123

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
May 7, 2013 by Leila

Chemisty
how do you determine how many electrons are in the highest occupied energy level? For example many electrons are in the highest occupied energy level Group 3A Count them up. For example, you know 1s2, 2s2, 2p6, 3s2, 3p6, etc etc. You can go to www.webelements.com and click on ...
October 31, 2006 by Bryan

chemistry
1.what is meant by atomic number of an element? 2.the mass number of an element is 18,it contains 7 electrons.what is the number of protons and neutrons in it?what is the atomic number of the element? 3.an element has an atomic number of 11 and its mass number is 23?what is ...
May 4, 2012 by pooja

chemistry
The binding energy of an electron to a metal surface is 184 kJ/mol. What is the threshold wavelength (in nm) for the onset of the photoelextric effect?
September 21, 2008 by Erika

PHYSICS- Laws of Motion
When the cathode is heated from the 6.3 V AC supply, electrons are emitted from its surface. These electrons fall on the grid (which is positive) and a current flows in the cathode/grid circuit. As electrons stream from the cathode toward the grid, they bombard atoms of the ...
January 13, 2010 by Nathalie

Chemistry
How do i determine how many electrons are in the highest occupied energy level? For Example how many electrons are in the highest occupied energy level group 3A I answered this for you when you first posted yesterday (last night). Tell us what you don't understand about the ...
November 1, 2006 by Bryan

phisic
(a) One such reaction fuses two nuclei of carbon-12 (12/6C ) to form an atom of neon (20/10Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the products in the usual way. (b) Another ...
April 20, 2013 by john ergent help pleaseeeeeeeeeeeeeeeeeee?

science help?
(a) One such reaction fuses two nuclei of carbon-12 ( 6 12C ) to form an atom of neon ( 10 20Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the products in the usual way. (b) Another ...
March 18, 2013 by sam

Business English
Which of the following is a characteristic of communication in high context cultures? A. Written agreements are binding? B. There is reliance on nonverbal signs to communicate. C. Oral agreements are not binding. D. There is preference for direct communication
October 23, 2011 by Diana

Science (urgent)
I have 2 biology questions I really need help with, they are due tommorow and I don't know if I'm right. 1)As an energy carrier, ATP differs from NADPH in that: a)ATP carries less energy than NADPH. b)ATP transfers energy through redox reactions whereas NADPH uses ...
November 1, 2011 by Jake

science
(c) The kinetic energy of the emitted electrons is measured to be 15.2 eV. What is the first ionization energy of Hg in kJ/mol?
December 16, 2012 by Samantha

CHEM AP please help!!
Why does the octet rule not hold for many compounds containing elements in the third row of the periodic table and beyond? (Select all that apply.) 1. Atoms of elements in the third period are less subject to destabilization from additional electron-electron repulsions. 2. ...
November 7, 2011 by kali maa

Chemistry
What property of nonmetallic elements makes more likely to gain electrons than lose electrons? Non-metals already have outside shells that are more than half filled (escept for group 4 elements) and it is easier to fill the shell by adding 2 or 3 electrons than to lose 5 or 6 ...
November 15, 2006 by Bryan

Chemistry
Hi, This is one of my chem hw problems. Does anyone have links to websites that might help me solve this..or equations? It sounds like there are two parts to the question but I'm not sure. Volts and Joules? 1. Electrons are used to determine the structure of crystal surfaces. ...
October 27, 2008 by Anne

AP Chemistry
To eject electrons from the surface of potassium metal, 222kJ/mol of electrons are needed. a) What minimum frequency of light is needed to supply the required energy? b) What is the wavelength of this light? c) If potassium is irradiated with light having wavelength of 350 nm...
November 17, 2010 by qwerty123

chemistry
give the total number of protons and electrons in each atom Cr2+ 24 protons 22 electrons Cr3+ 24 protons 21 electrons Ni3+ 28 protons 25 electrons Ni4+ 28 protons 24 electrons
February 6, 2012 by kr

science
getting ready to turn this in just want to check my answers any takers?? 1. In an atom, electrons ____. (1 point) are located in the nucleus are paired with neutrons are located in the electron cloud are always in the same place 2. The maximum number of electrons in the second...
April 11, 2013 by T-mara

Science
The maximum number of electrons in the second energy level of an atom is ____. two four eight ten The number of _____ is equal to the atomic number. protons neutrons electrons both a and c
March 7, 2013 by Raelyn

communication
Which of the following is a characteristic of communication in high-context cultures? Written agreements are binding. There is reliance on nonverbal signs to communicate. Oral agreements are not binding. There is a preference for direct communication.
June 3, 2010 by helen

communication
Which of the following is a characteristic of communication in high-context cultures? Written agreements are binding. There is reliance on nonverbal signs to communicate. Oral agreements are not binding. There is a preference for direct communication.
June 24, 2010 by anna

Chemistry(Please check)
1)For an atom of carbon how many valence electrons are "s" electrons? 2 2) How many are "p" electrons? 4 3)How many (total) electrons in carbon are paired? 2 4) How many are unpaired? 1 Are these correct.
November 1, 2011 by Hannah

physics
Orange light with a wavelength of 6.00x102nm is directed at a metallic surface with a work function of 1.60eV. Calculate: a) The maximum kinetic energy of the emitted electrons b) Their maximum speed c) The cutoff potential necessary to stop these electrons (V=Ek/e)
June 6, 2013 by Anonymous

Chemistry - Periodic Trends
For the isoelectronic series S2-, Cl-, Ar, K+, and Sc3+, which species requires the least energy to remove an outer electron? thanks They all have the same number of electrons (40) in the same shell arrangements, but S(2-) has the least nuclear charge. That should be a clue. ...
April 21, 2007 by alexa

Chem Check Please!!!
All of the following statements concerning crystal field theory are true EXCEPT a. in low-spin complexes, electrons are concentrated in the dxy, dyz, and dxz orbitals. b. in an isolated atom or ion, the five d orbitals have identical energy. c. low-spin complexes contain the ...
May 6, 2014 by Anonymous

Chemisty
Answer the questions below for an element that has the electron configuration 1s2 2s2 2p6 3s2 3p3. A. What is the symbol for this element? B. What is the atomic number of this element? C. How many unpaired electrons does an atom of this elelemt have? D. How many valence ...
October 20, 2013 by Joe

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