\(\sigma_{1 {~s}}^{2} \sigma_{1 {~s}}^{*} \sigma_{2 {~s}}^{2} \sigma_{2 {~s}}^{*_{2}}\left(\pi 2 {p}_{{x}}^{2}=\pi 2 {p}_{{y}}^{2}\right)\left(\pi_{2 {px}}^{*}=\pi_{2 {py}}^{*}\right)\)
Zero unpaired electron