why helium do not form molecule explain by VBT and MOT

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Solution

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 He₂molecule = 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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