Hypothetical Helium Molecule (He2)


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Each helium atom has two electrons in 1s-orbital and therefore, there are four electrons in He2 molecule. These electrons will be accommodated in si1ls and s*1s MOs as shown below.

fig 1.18 - Molecular orbital energy level diagram for He2 molecule (hypothetical)The electronic configuration for helium molecule may be written as:

He2: (s1s)2 (s*1s)2

calculation of bond order in helium

The zero bond order value indicates that there is no net bonding and He2 molecule should not be formed. In fact, there is no experimental evidence for the existence of this molecule.



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