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Acc.to MOT He2^+ have same energy of two isolate He atom
That is wrong. Given ion has bond order 0.5 while isolated He atoms has no interaction. Due to weak attractive force ion has lower energy.
H2exists as the two electrons of H-H bond occupy the lower energy bonding molecular orbital (or sigma bonding molecular orbital), where they are attracted to both positively charged nuclei. It is this electrostatic attraction that gives a covalent bond its strength.Lack of existence of He2because each He atom comes with two electrons. He2would have 4 electrons, the first 2 filling lower energy molecular orbital and the other 2 filling higher energy anti-bonding molecular orbital. The two electrons in the higher energy orbital would cancel out the effect of lower energy orbital thus He2 cannot exist.
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