Inert gases are monoatomic. Explain in terms of MO theory.

Explanation

The molecular orbital energy level diagram for inert gases shows that the number of electrons in bonding molecular orbitals are equal to those in the antibonding molecular
orbitals: i.e., bond order (of inert gas)=`((N_(b)-N_(a))/(2))=0`
Therefore, all inert gases are monoatomic.
For e.g., `He(2)`, electronic configuration of `He_(2)` is:
`He_(2)-(sigma_(1s))^(2)(sigma_(1)^(**))^(2)`
`therefore`Bond order`=(2-2)/(2)=0`