$1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}_{\mathrm{x}^{0}} \mathrm{p}_{\mathrm{y}}^{1} \mathrm{p}_{\mathrm{z}}^{0}$

$1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}_{\mathrm{x}}^{0} \mathrm{p}_{\mathrm{y}}{ }^{1} \mathrm{p}_{\mathrm{z}}^{2}$

$1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}_{\mathrm{x}}{ }^{1} \mathrm{p}_{\mathrm{y}}^{2} \mathrm{p}_{\mathrm{z}}^{0}$