Question

How many unpaired electron does $O_2$ molecule have?

• A. $1$
• B. $0$
• C. $2$
• D. $3$

Answer 1

The correct option is C $2$

Electronic configuration of $O_2$ is $He]2s^{2}2p^4$.

From the molecular orbital diagram it is clear that $O_2$ has 2 unpaired electron.