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a
Na+
b
F
c
N
d
O2-
answer is C.
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Detailed Solution
1) Na+,no unpaired electron 1s2,2s2,2p62) F, one unpaired electron 1s2,2s2,2p53) N, three unpaired electrons 1s2,2s2,2p34) O2−, no unpaired electron 1s2,2s2,2p3