Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question
Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryChemical Bonding and Molecular Structure1 Mark
Question
Why does He2 not exist?
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Answer
He2 does not exist because repulsive forces dominate attractive forces and bond order is zero for He2. Secondly its bond order is zero. $\text{He}_2(4)\sigma_{\text{ls}^2}\sigma*_{\text{ls}^2}$ $\text{B.O.}=\frac12(\text{N}_\text{b}-\text{N}_\text{a})=\frac12(2-2)=0$
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