Question

He 2 does not exist explain in terms of LCAO?​

Answer 1

According to the molecular orbital theory He has two electrons in the outermost shell and thus it is chemically stable because it's duplet is complete. Hence it does not participate in the bond formation and molecule must have a bond to exist which is not in case of Helium.

helium does not contain definite bond order or by other means it does not contain natural value by difference  

averaging of bonding and antibonding electrons

hope it helps !! @_@

Answer 2

Explanation:

citric acid ka formula