Now we will carry out some examples of diatomic molecules to find out the ground state from its electronic configuration.

Closed shell configuration:
For any closed shell molecular electronic configuration, for example , there is no net orbital and spin angular momentum. So, L = 0 and S = 0. The term will be always,  state.

One unpaired electron:
Let us take the case of hydrogen molecular ion  
The electronic configuration (figure-34.3).

Bond order
= (no. of electrons in bonding orbital- no. of electrons in anti-bonding orbital) / 2
= (1-0) / 2 = ½ > 0. Molecular electronic state is stable.
Molecular term for the ground state is  

     (figure-34.4)

Bond order = ½ > 0.
Stable ground state will form.
Parity = g ´ g ´ u = u     Molecular term for the ground state is