Question

How many anti bonding electrons are there in $O_2$ molecule?

• A. $10$
• B. $8$
• C. $6$
• D. $4$

Answer 1

The correct option is C $6$

The bonding electrons are those electrons located in bonding MO's. They are shown in green in the above diagram.

Now focus on finding the number of anti-bonding electrons, which are located in anti-bonding MO's. They are shown in red in the above diagram.This gives you a total of 6 anti-bonding electrons.