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  4. In He2 the electrons in bonding and anti-bonding orbitals are

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Q. In $He_{2}$ the electrons in bonding and anti-bonding orbitals are

J & K CETJ & K CET 2015Chemical Bonding and Molecular Structure

Solution:

Number of electron in $He _{2}=4$
$MO$ configuration of $H e_{2}=\sigma 1 s^{2}, \sigma^{*} 1 s^{2}$
Here, $N_{b}$ (bonding electrons) $=2 N_{a}$ (antibonding electrons) $=2$