Why He2 molecule does not exist? Explain by MOT.
Electronic configuration of He is 1s2.Molecular Orbital Diagram for He2 is
(Refer to Image)
Bond order= (No. of electrons in bonding molecular orbital)-(No. of electrons in anti-bonding Molecular orbital)2
=2−22=0
∴He2 bond order is 0. There is no bond existing between atoms of He2. So He2 does not exist.