1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10

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1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 4s 2 , 3d 10 , 4p 6 , 5s 2 , 4d 10 , 5p 2 or [Kr] 5s 2 , 4d 10 , 5p 2
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A4 © 2015 L.S. Brown 3. For each of the following questions, please write your answer clearly in the space provided. For parts (a) and (b), consider the following ions and atoms. F Mg 2+ Na + Ne N 3— (2 pts) (a). Which ONE of the atoms and ions above would have the smallest radius? Smallest radius: _____ Mg 2+ ______ (2 pts) (b). Which ONE of the atoms and ions above would have the smallest ionization energy? Smallest ionization energy: ____ N 3– ________ For parts (c) through (f), consider the elements in the 3 rd row of the periodic table (Na through Ar). (2 pts) (c). Which ONE of these elements is most likely to form a cation with a charge of 3+? Forms 3+ cation: ____ Al ________ (2 pts) (d). Which ONE of these elements has the smallest ionization energy? Smallest ionization energy: _____ Na _______ (2 pts) (e). Which ONE of these elements has the largest (most negative) electron affinity? Largest (most negative) electron affinity: _____ Cl _______ On many of the blue exams, Cl was initially marked wrong here. I added back those 2 points, but it may still look like it was marked wrong on some of the papers. (2 pts) (f). How many of these elements would be paramagnetic in their ground state electron configuration? Number of paramagnetic elements: _____ 6 _______ (2 pts) (g). Which ONE of the following compounds would best be described as ionic? F 2 LiF CO GaAs HF Ionic compound: ____ LiF _______ (2 pts) (h). What property should be considered in answering part (g) above? Relevant property: _ electronegativity (difference) __
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NAME:_________________________________ © 2015 L.S. Brown A5 4. The atmosphere around the sun contains many He + ions, and the emission of light by these ions has been studied extensively. If the electron in a He + ion is excited to a particular energy level with n = 5, it can return to the ground state by emitting a total of 3 photons, with wavelengths of 26 nm, 469 nm, and 1014 nm (not necessarily emitted in that order).
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