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Grade: 12th pass

                        

Acc.to MOT He2^+ have same energy of two isolate He atom

2 years ago

Answers : (2)

abhishek mishra
51 Points
							
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. 
2 years ago
dolly bhatia
200 Points
							
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 Hecannot exist.
2 years ago
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