Helium Molecule Ion (He2+)


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This molecule contains three electrons, two from one helium atom and one from the other helium (He+) ion. The molecular orbital electronic configuration of the molecule is:

 

bond order in helium molecule ion

 

 

stability of helium molecule ion

 

Its bond dissociation energy has been found to be 242 kJ mol-1. The molecule is expected to be paramagnetic and the same has been experimentally observed also.

Similarly, the molecular orbital configurations of Li2, Be2, B2 and C2 molecules can be written as given below:

 

Molecule M.O configuration Bond Order Magnetic character
Li2 KK (σ2s)2 1 Diamagnetic
Be2 KK (σ2s)2σ*2s)2 0 Molecule does not exist
B2 KK (σ2s)2σ*2s)2(π2px)1(π2py)1 1 Paramagnetic
C2 KK (σ2s)2σ*2s)2(π2px)2(π2py)2 2 Diamagnetic

 

Here KK corresponds to (s1s)2 (s*1s)2



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