Chemistry - CHEMICAL BONDING Question with Solution | TestHub

${\mathrm{He}}_2=$ Total electron $=4$

$={\mathrm{\sigma }}_{1{\mathrm{s}}^2}^{}{\mathrm{\sigma }}_{1{\mathrm{s}}^2}^{*}\Rightarrow \mathrm{B}.\mathrm{O}.=\frac{1}{2}[\mathrm{Nb}-\mathrm{Na}]=\frac{1}{2}[2-2]=0$

Bond order $=0$, so ${\mathrm{He}}_2$ does not exist.