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why He2 does not exist?

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why He2 does not exist?

Posted by Jerry Nongspung 6 years, 7 months ago

CBSE > Class 11 > Chemistry

3 answers

Priya Dharshini ? 6 years, 7 months ago

Wlcm

Ankit Singh 6 years, 7 months ago

Thanks for the answer priya

Priya Dharshini ? 6 years, 7 months ago

Helium and the other inert gases have completely filled octets, and so they have zero valency. That means, their combining capacity is zero, and so they exist as monatomic molecules such as He, Ne, Ar etc. Helium atom has the electronic configuration 1s2. According to the molecular orbital theory, in a supposed He2 molecule, both the bonding and the antibonding orbitals will have 2 electrons each. And so, the bond order (half the difference in the numbers of bonding and antibonding electrons) for such a diatomic entity is zero. That means, the He2 molecule has no existence.

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