F10Q9W11 - CHEM 0110 QUIZ 9 WEEK 11 MONDAY, 1:00 PM...

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CHEM 0110 QUIZ 9 WEEK 11 MONDAY, 1:00 PM November 8, 2010 NAME_______________________________________________________________________ 1. For each of the following statements, state whether it is True or False. Give your reasoning. a) For the hydrogen atom, the ℓ quantum number must equal n-1. For all other atoms, ℓ can have any integral value from 0 to n-1. b) For the hydrogen atom, the 3s, 3p and 3d subshells have the same energy; for all other atoms, the 3s, 3p and 3d subshells have different energies. 2. Give the electron configuration, including the noble gas core, for the following species: Co (cobalt) 3. Consider the elements Br and Ca: a) Identify the atom with the larger atomic radius. b) Identify the atom with the larger ionization energy. c) Explain how the sizes of the atomic radius and/or the ionization energy determine that Ca has the properties of a "metal" and Br has the properties of a "nonmetal". ANSWERS 1. a) False. For all atoms, ℓ can have any integral value from 0 to n-1. b) True. The H atom is a special case, because it has only one electron. 2. Co: [Ar] 4s 2 3d 7 3. a) Ca: Atomic size decreases left to right across a period. b) Br: Ionization energy increases left to right across a period. c) [Grader: look for one valid, relevant statement] Metals can lose electrons easily to form cations. The ease of electron loss depends on the size of the ionization energy. Nonmetals like to attract electrons; small atoms tend to do this more easily than large atoms. For Make-up Only Regular recitation Day: Time: instructor: Quiz Score: Group score: Scores recorded by:
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CHEM 0110 QUIZ 9 WEEK 11 MONDAY, 6:00 PM November 8, 2010 NAME_______________________________________________________________________ 1. Write the complete electron configuration of each of the following atoms: F Sn 2. Give the number of valence electrons in the F atom and in the Sn atom. 3. a) Which element in the third period of the periodic table has the smallest ionization energy? Give your reasoning. b) Which element in the third period has the most negative electron affinity? Give your reasoning. ANSWERS 1. F: 1s 2 2s 2 2p 5 Sn: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 2 2. F has 7 valence electrons (2s and 2p) Sn has 4 valence electrons (5s + 5p) 3. a) Na. I.E. increases left-to-right across a period. b) Cl. Gaining an electron is very favorable for the halogens, as it yields a closed-shell configuration. [Accept any valid reason.] For Make-up Only Regular recitation Day: Time: instructor: Quiz Score: Group score: Scores recorded by:
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CHEM 0110 QUIZ 9 WEEK 11 TUESDAY, 8:00 AM November 9, 2010 NAME_______________________________________________________________________ 1. Identify the atoms, which have the following electron configurations. a)
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This note was uploaded on 02/20/2011 for the course CHEM 110 taught by Professor Dr.huston during the Spring '06 term at Pittsburgh.

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F10Q9W11 - CHEM 0110 QUIZ 9 WEEK 11 MONDAY, 1:00 PM...

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