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May 28, 2014

He2 molecule does not exists

Why He2 molecule does not exists?



Satyanarayana Prasad

Ans: Electronic configuration of He atom – 1s2

According Linear combination of atomic orbitals the He2 molecule electronic configuration is – σ1s2 σ*1s2

Thus there are equal number of electrons present in bondig molecular orbitals and anti-bonding molecular orbitals.

Bond order in He2 molecule = ½[number of electrons in bonding orbital- number of electrons in anti bonding orbital]

= ½[2-2]

= ½[0]

= 0

Thus there are Zero (0) number of bonds present between He atoms in He2 molecule.

Thus there is no existence of He2 (diatomic Helium)molecule.

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