use the M.O theory, explain why Be2 molecule does not exist?
Be2 is unstable and does not exist in nature as it has zero bond order.
The electronic configuration of Be2 is ( s 1s)2 ( s *1s)2 ( s 2s)2 ( s *2s)2.
We are showing below the molecular orbital diagram for Be2.
Now ,
where Na and Nb are the number of electrons present in bonding and antibonding molecular orbitals respectively.
So,