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Question

The number of electrons that are unpaired in oxygen molecule is:
  1. 12
  2. 8
  3. 16
  4. 2

A
12
B
16
C
2
D
8
Solution
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O2 contains 2 unpaired electrons in antibonding orbitals. The electronic configuration of the O2 containing 16 electrons can be written as:

1s21s22s22s22pz22px22py22px12py1

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