why He2 cannot exist on the basis of MO theory?
Asked by imtiyazmulla68
24th April 2018,
10:26 AM
Answered by Expert
Answer:
Let us find the reason by understanding the difference between the formation of H2 and He2 molecule.
The atomic number of the H is 1 hence has 1 valence electron
whereas the He atom has 2 valence electrons.
If draw MOT diagram :
For H2:
Bond order = Bonding electrons - antibonding electrons
2
= 2-0
2
= 1
Hence H2 molecule exists with a single bond
For He2:
Bond order = Bonding electrons - antibonding electrons
2
= 2-2
2
= 0
Hence He2 molecule does not exist because of zero bond order.
Answered by Expert
24th April 2018,
11:35 AM
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