What do we call the valence when it is filled When the outer electron level is filled, we call it the noble gas configuration. I am not certain what you mean by valence when it is filled.

18,917 results

  1. chem

    1. under what circumstances is the molecular geometry around a single central atom the same as the electron group geometry around the central atom? 2.If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded

  2. Chemistry-help needed

    I am asked to draw the 'dot and cross' diagram to show the ionic bonding in sodium chloride. I am asked to show only the outer electronic structure. Sodium has 2.8.1 electronic configuration. After losing 1 electron to chlorine, it has 2.8 electronic

  3. chemistry

    An electron in a hydrogen atom relaxes to the n= 4 level, emitting light of 138 THz . What is the value of for the level in which the electron originated? Please show each step and the equation.

  5. chemistry

    I am confused on how to even start this problem... A ground state H atom absorbs a photon of wavelength 94.91 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 1281 nm to reach an intermediate level, and

  6. Chemistry

    1) The letter "p" in the symbol 4p^3 indicates the ___. A) spin of an electron B) orbital shape*** C) principal energy level D) speed of an electron 2) If the spin of one electron in an orbital is clockwise, what is the spin of the other electron in that

  7. Chemistry

    How many valence electrons does molybdenum have? (give only 1 answer) Go to this site and look for the electrons available in the outside shells. Click on element #42 and scroll down the menu on the left side until you come to electron configuration.

  8. chem

    1. what is the quantum numbers of the last electron of Sb?(n= l= ml= ms=) and why the answer are this number? 2.how many electrons would be found in the n=6 level if all possible orbitals were completely filled with electrons? how to calculate this one?

  10. Chemistry! HELP;

    An atom of potassium (K) has 19 protons: 18 electrons in its inner electron energy levels and 1 electron in its outer energy level. What is the easiest way for this atom to get a filled outer energy level? What is formed?

  11. chem

    There are eight markers in a full set, but Flora and Frank each only have seven markers.Flora is missing the red marker, and Frank is missing the blue marker.What can they do so that each has a full set of markers? * steal the ones they need share with

  12. chemistry

    The electron in the n = 5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move?

  13. Chemistry

    1) What is the atomic # for selenium? 34 2) Write the full electron configuration for selenium following the (n+l) rule? I am not sure what is meant by n+l 3) write the electron configuration, grouping electrons by their "n" values. [Ar]3d10 4s2 4p4 Are

  15. General Chemistry

    An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 114 THz. What is the value of n for the level in which the electron originated? I am halfway through, but uncertain as to how to simplify the problem to completion. (6.63 x 10^-34

  16. physics

    ) A hydrogen atom has its electron in the n = 5 level. The radius of the electron's orbit in the Bohr model is 1.323 nm. Find the de Broglie wavelength of the electron under these circumstances. What is the momentum, mv, of the electron in its orbit?

  17. Science

    1.which is most likely to be part of an ionic bond? A. an atom with no valence electrons B. an atom with one valence electron C. an atom with two valence electrons D. an atom with three valence electrons My answer is C.an atom with two......

  18. Chemistry

    What is the electron configuration called that has 18 electrons in the outer energy level and all of the orbitals filled? Noble gas configuration

  20. chemistry

    Which statement describes the principal quantum number (n)? A. The quantum number that indicates the subshell occupied by an electron B. The quantum number that indicates the energy level of the electron C. A subdivision of an energy level in an atom D.

  21. SCIENCE ;; Valence Electrons.

    Helium is in group 18 of the periodic table. How is helium different from the other elements in this group? A. Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons. B. Helium atoms have 2

  22. Chemistry

    An electron initially in the n = 2 energy level in a hydrogen atom absorbs a photon of light with a frequency of 6.167 x 1014 s-1. Calculate the new energy level the electron will occupy. I am not sure how to being.

  23. Chemistry

    Element x has the highest first electron affinity in its period, the ground state electron configuration of its common is: [Kr] 5s2 4d10 5p6 Element Y is the second largest element in its period; its valence electron are in orbital(s) that have n= 6. What

  25. chemistry

    Which of the statements correctly describes the reactivity of noble gases, according to the octet rule? They have eight electrons in their valence shell, so noble gases are very unreactive. They have eight electrons in their valence shell, so noble gases

  26. Chemistry- Dr. Bob

    An electron in the n=7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 2166 nm. What is the value of n for the level to which the electron relaxed?

  27. physical science

    When moving across a period from left to right in the periodic table, excluding transitions elements, which trend occurs? (1 point) A. Valence electrons increase by one. B. The energy levels decrease by one. C. The energy level increases by one. D. valence

  28. Chemistry

    An electron in the n=5 level of an H atom emit a photon of wavelength 1281nm. To what energy level does the electron move? Thanks for ur help.

  30. Science

    What element has 7 Valence Electron and 3 energy levels?

  31. 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

  32. Chemistry Periodic Trends

    The electron affinities of the elements from aluminum to chlorine are -44, -120, -74, -200.4, and -384.7 kJ/mol respectively. Rationalize the trend in these values. Electron affinity is the energy absorbed (endothermic) or emitted (exothermic) by the

  33. Physical science

    Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)? (1 point) Francium has more valence electrons, and they are in a higher energy level. Barium has fewer valence electrons, but they are in a higher energy

  35. Chemistry

    Hypothesis 2, including explanation, for reactivity trend down a column: Metal reactivity will increase as you go down a group, because the nuclear shielding increases and causes the nucleus’ hold on the valence electron to weaken, therefore it is easier

  36. Chemistry

    40. An element has the configuration [He]2s^2. a. Which element is it?- Beryllium b. Is it metal or nonmetal?- metal c. How many valence (or outer shell) electrons does it have?- 2 valence electrons. Is this correct? Thanks -MC

  37. chemistry

    An electron in a hydrogen atom relaxes to the n= 4 level, emitting light of 138 THz. What is the value of n for the level in which the electron originated?

  38. Science

    1. groups/ family of elements are ones which: A. Have the same number of electrons in the valence/ outer engery level B. Have exactly 8 electrons in the valence shell outer energy level C. Have the same number of protons in the nucleus 2. A period

  40. 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

  41. Chemistry

    The electron in a hydrogen atom, originally in level n = 8, undergoes a transition to a lower level by emitting a photon of wavelength 3745 nm. What is the final level of the electron? a) 5, b)8, c)9, d)6

  42. chemical

    An Electron In The N = 5 Level Of An H Atom Emits A Photon Of Wavelength 94.98 Nm. To What Energy Level Does The Electron Move?

  43. Chemistry

    What is the final energy level of an electron that absorbs energy of 656nm if the electron started at the n=2 level of the hydrogen atom?

  45. Chem

    When two atoms approach each other and react with each other, it is their outer shells that come into contact first, and it is therefore the electrons in their outer shells that are normally involved in any chemical reaction.electrons are known as Orbiting

  46. Science

    Which is most likely to be a part of an ionic bond? An atom with no valence electrons An atom with one valence electron An atom with two valence electrons An atom with three valence electrons To form an oxygen molecule , Two oxygen atoms share two

  47. Science

    Which is most likely to be part of an ionic bond? A. An atom with no valence electrons B. An atom with one valence electron C. An atom with two valence electrons D. An atom with three valence electrons I think it is B.

  48. Chemistry

    The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179E-18/n2 J where n is the quantum number that specifies the energy level. What is the frequency in Hz of the radiation emitted when an electron falls

  50. Physics

    When an electron makes a transition from its first quantum level to ground level, the energy difference is carried by the emitted photon. In comparison, how much energy is needed to return an electron at ground level to the first quantumlevel?

  51. Science

    Which of the following statements is not true of using electron dot diagrams? A. The element's group number provides a clue about the number of valence electrons. B. An element with eight valence electrons is chemically unstable. C. Dots should be placed

  52. Chemistry

    ELement A has a valence electronic structure of ns2np1. Element B has the valence electronic structure of ns2np5. Write a formula for the compound that would be formed from elements A and B. Element A has three electrons to lose to make the last shell

  53. chemistry

    Which of the following is true? A. Group 1 elements are more reactive than the group 2 elements because they have more valence to lose. B.Lithium is the least reactive element in group, because its valence electron is held more tightly than the others in

  55. 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

  56. Chemistry

    WHy is Copper an exception in electron configuration? Copper is not an exception except in our minds. The exception lies in our attempt to explain electron configurations. In the case of Cu and Cr for the 3d series, they don't fall into our neat pattern;

  57. Electron transition

    The electron in a hydrogen atom in level n= 8 undergoes a transition to a lower leve by emitting a photon of wavelength 956 mom. What is the final level of the electron? A) 4 B) 8 C) 9 D) 1 E) 3

  58. Chemistry

    Ok an atom loses an electron becomes positive-atom gainin electron becomes negative? Is that correct? that's w/ 1 electron in outer shell of one atom and the other atom receiving an electron to fill its outer shell

  60. Science ~CHECK MY WORK PLEASE~

    A scientist is trying to determine the identity of an element. It is highly reactive in water and forms an ionic bond with chlorine. It is also very shiny. The element is likely A. From Group 17 ********** B. From Group 1 C. From Group 15 D. A Noble Gas

  61. bonding types of compounds

    which is an example of a covalent compound? a.some electrons in carbon dioxide function as valence electrons in both carbon and oxygen. b.ions in a bar iron are surrounded by a large number of valence electrons. c.silver ions are surrounded by a sea of

  62. Science

    What are the Lewis structures for hydrogen cyanide and cyanogen?? I think it's H:C:::N :N:::C:C:::N: with the inner upper electrons being shared. For the elements in these compounds, which is the noble gas whose electron configuration is attained in the

  63. Chemistry

    Which one of these statment are true? 1. most of the mass of an atom is in the electron cloud. 2. A proton has a charge of 1+. 3. Elements that are very reactive have a filled outermost energy level.

  65. Chemistry

    The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179 x 10-18/n2 J where n is the principal quantum number for the energy level. What is the frequency in Hz of the electromagnetic radiation absorbed

  66. Chemistry

    When a sodium atom absorbs light at 330.2 nm, the 3s electron is promoted to the 4p level. How much energy would be required for ionization once the electron is in the 4p level?

  67. Chemistry

    When a sodium atom absorbs light at 330.2 nm, the 3s electron is promoted to the 4p level. How much energy would be required for ionization once the electron is in the 4p level?

  68. physics

    When an electron makes a transition from its first quantum level to the ground level, the energy difference is carried by the emitted photon. In comparison, how much energy is needed to return an electron at ground level to the first quantum level?

  70. chemistry

    The energy levels the electron can occupy in the He+ ion can be calculated using the energy level equation. Calculate the frequency (Hz) of the photon emitted when the electron goes from a n= 4.00 energy level to a n= 3 energy level. Express answer in

  71. math

    100 people set up a phone call system so that the initial contact person call three persons, each of whom calla three persons,and so on until all have been contacted. The maximum people who do not need to make calls is? Very Simple Question How would you

  72. chemistry

    The energy levels the electron can occupy in the H atom can be calculated using the energy level equation. Calculate the wavelength (nm) of the photon absorbed when the electron goes from a n= 1 energy level to a n= 3 energy level. Express answer in

  73. biology

    Picture true of false The atom shown in the diagram has 4 energy levels or shells. 2. The atom shown in the diagram above has a total of 5 electron orbitals. 3. Each energy level consists of 2 or more orbitals. 4. The second energy level consists of 4

  75. Science 8b final

    which of the following elements is most likely to be the least reactive? A. a group of 2 element B. a group of 17 element C an element with 1 valence electron D an element with 8 valence electrons

  76. Chemistry

    what is the charge on a typical ion for group 1A? how can i figure out the answear to a question like this.. then group 7A,6A,2A Group 1A has one electron in the outer orbit, it is lost on ionization, and the charge on the metal ion is +1. Group 7a has

  77. 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

  78. Chemistry

    7. Which of the following is true? A. Cesium is the most active group 1 metal, because its valence electron is held more tightly than the others in the same group. B. Group 1 elements are more reactive than the group 2 elements because they have more

  80. science

    Chemical Bonds.. Lesson 3 Unit 4. multiple choice. first question- which is most likely to be part of an ionic bond? - an atom with no valence electrons - an atom with one valence electron - an atom with two valence electrons - an atom with three valence

  81. Chemistry - Periodic Table+IE(check+help)

    The following data lists the ionization energies for a given atom: IE1 = 738Kj/mol; IE2 = 1451Kj/mol; IE3 = 7733Kj/mol. Predict the valence electron configuration for this atom, and explain your reasoning. i do not understand this question but i will give

  82. Chem

    How do you figure out the Noble Gas Configuration? Also, why do you not put in the "p" level and when do you( if you even do) put it in? You need to be more specific about your question. Elements that lose electrons (Na, Ca, Al, etc) gain the noble gas

  83. Science!

    Which is most likely to be part of an ionic bond? A. An atom with no valence electrons B. An atom with one valence electron C. An atom with two valence electrons D. An atom with three valence electrons Is the answer B?

  85. Chemistry

    Which of the following electron dot structures would have a charge of +2 and 1 valence electron? a) Mg2+ b) B2+ c) Al2+ d) Na2+

  86. Chemistry

    Energy Level Transfer of Hydrogen's electron. For each line, determine the prinicpal energy level to which hydrogen's electron was excited. When the electron fell to the 2nd level, energy was released corresponding to each of the lines. E= 2.179X10-18

  87. Science

    Which is most likely to be part of an ionic bond? A. An atom with no valence electrons B. An atom with one valence electron C. An atom with two valence electrons D. An atom with three valence electrons

  88. Science

    Which is most likely to be part of an ionic bond? A. an atom with no valence electrons B. an atom with one valence electron C. an atom with two valence electrons D. an atom with three valence electrons

  90. 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

  91. pyhsical sciencve

    In Rutherford's gold foil experiment the alpha particles pass through which part of the atom? A. the nucleus B. the proton shield C. the valence electron shell D. the electron cloud

  92. chemistry

    help needed in drawing the diagram to show how hydrogen has numerous spectral lines I also need help with this question.... ---------------- ---------------- ---------------- ---------------- ---------------- -------------------- Each line above represents

  93. physics

    (a) A hydrogen atom has its electron in the n = 5 level. The radius of the electron's orbit in the Bohr model is 1.323 nm. Find the de Broglie wavelength of the electron under these circumstances. (b) What is the momentum, mv, of the electron in its orbit?

  95. Chemistry

    What elements contains a full third energy level and what element contains the first p electron?? Here is an interactive site that will show you how the 1s, 2s, 2p, etc levels fill. Post your answers here if you want someone to check them. Also, you need

  96. physic

    Does anybody know how I can find the mass of the electron for this question. I need to find it first to solve for the real one but don't see mass anywhere in the question.I see radiant and speed but no mass The radius of circular electron orbits in the

  97. Science ENGR

    Consider a laser which emits photons with a wavelength of 1.55 micrometers. The laser has a lower electron level Ei and an upper electron level Eu. A power supply pours electrons into the upper energy level and these electrons fall down in a time T= 0.1

  98. chemistry

    I am confused on how to even start this problem... A ground state H atom absorbs a photon of wavelength 94.91 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 1281 nm to reach an intermediate level, and

  100. Chemistry

    An electron in a hydrogen atom absorbs 15.5 x 10-20 J of energy. If the electron originated at energy level 3, to what level was it excited?

  101. chemistry

    What do we call the valence when it is filled When the outer electron level is filled, we call it the noble gas configuration. I am not certain what you mean by valence when it is filled.

  102. Chemistry (please Help!!)

    determine which experiences a lower effective nuclear charge. using words and/ or drawings explain why. A) an electron in a 2s or an electron in a 2p B) a valence electron on sulfure or a vance electron on silicon C) a valence electron on chlorine or a

  103. Chemistry

    I have a series of questions: What describes the arrangement of elements which repeat similar properties? Isn't the answer periodic table. next question who is the father of modern day periodic based on x-ray diffraction? Isn't the answer Dmitri Mendleev

  105. chemistry

    Hi, can you tell me what the valency of Aluminium and Selenium? hi i was going to pose that question im glad you did are you doing s103 by any chance Al is in group IIIA (or 3) depending upon the system you are using; therefore, it has three electrons in

  106. chemistry

    List the following in order of increasing force of attraction 1. an electron in the outer shell of carbon atom (in the ground state level) 1.1*10^(-10)m a part from nucleus. 2.an electron in the outer shell of oxegen atom (in the ground state level)

  107. 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

  108. Chemistry - Periodic Table+IE(check+help)

    The following data lists the ionization energies for a given atom: IE1 = 738Kj/mol; IE2 = 1451Kj/mol; IE3 = 7733Kj/mol. Predict the valence electron configuration for this atom, and explain your reasoning. i do not understand this question but i will give

  110. chem

    the atom of element A has 2 electrons in its highest energy level N. a)what is the special name given to elements in the same gp as A? i answered as alkali earth metal because the valence electron is 2. am i right?

  111. physics

    A simple Geiger counter is constructed out of a setup similar to what we just used in problem 5. A thin wire with a linear charge density _ is held in the center of a cylindrical tube, which is filled with an inert gas. When a high speed 2 particle coming

  112. chem please explain to me!

    can someone please elpain to me the formation of binary ionic compounds from its constituent element. cuz I don't understand! thanks I really thank you guys alot! What grade are you in? Do you know about s and p orbitals? um.. why does it matter??? and I

  113. Science

    It is easier to move an electron from the outer energy level than from one closer to the nucleus. A. true B.false I think this is true..?

  115. chemistry

    Hello, I have a question regarding the valence electrons of transition metals. I am aware of quantum numbers etc and how the s orbital gets filled before the d orbital but my question is that is if was asked to lets say group some elements according to

  116. Chemistry

    The homework question said "which 2nd row element has 6 valence electrons and a valence of 2?" I don't really understand the question, because oxygen would be the element with the 6 valence electrons, but wouldn't that mean that it has a valence of 6? Does

  117. Physics(semiconductors)

    Is electron and hole flow the same in a diode?is the following explanation correct .if not then please provide the correct one When diode is forward biased,the forward current is the sum of electron current and hole current.this current is diffusion

  118. chemistry

    How does the outer nth level in electron configuration compare to the period? and which level would be the exception?

  120. High School Chemistry

    Determine the number of valence electron and the oxidation numbers for each of the following atoms. 1. Pb atomic #82 #valence e-'s= oxidation# =

  121. Chemistry

    When showing chemical formulas for compounds, how do i know how many electrons an element gives up in it's outer level, or how many electrons an element gains in it's outer level?

  122. Science

    what is the electron arrangement for boron? and how do you find the valence electron for it? i know it has 3 v.e. but how do you find it

  123. Science

    How do i find the valence electron for Chlorine.

  125. Chemistry HELP!!

    What is the final energy level of an electron that absorbs energy of 656nm if the electron started at the n=2 level of the hydrogen atom?

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