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For the O2+ ion, give the total number of bonding electrons and the total number of antibonding electrons, respectively. (Report as a single string, e.g. if the answers are 14 and 7 write 147.)

1. 147
2. 157
3. 167
4. 177

Correct answer: 147

Solution

O2+ (15 electrons) has the configuration with 10 bonding electrons and 5 antibonding electrons in terms of the 2nd-shell count; including the K-shell (1s) gives 14 bonding and 7 antibonding total... actually counting all 15 e- gives bond order 2.5.

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