Which of the following is a valid Lewis structure for sulfur dioxide?
$O=S=O$
$O-S-O$
$O=S-O$
e) More than one of these structures are correct
14. Which structure contributes most to the resonance hybrid for the periodate ion, $IO_4^-$?
15. Which of the following ions or molecules do not obey the octet rule?
I. $CO$
II. $BH_3$
III. $I_3^-$
IV. $GeF_4$
V. $AsF_5$
a) I, II, and III
b) II and V
c) III and V
d) III, IV, and V
e) II, III, and V
16. How many lone pairs of electrons are there on the Br atom in the $BrF_5$ molecule?
a) zero
b) one
c) two
d) three
e) four
17. Draw the Lewis structures for the following four ions: $NO$, $NO_2^-$, $NO_2^+$, $NO_3^-$. Based upon the Lewis structures, which should have the longest N-O bond? Which should have the shortest N-O bond?
longest N-O bond shortest N-O bond
a) $NO_3^-$ $NO$
b) $NO_2^-$ $NO_2^+$
c) $NO_2^-$ $NO$
d) $NO_2^+$ $NO$
e) $NO_3^-$ $NO_2^+$
