1s22s22p31 s^{2} 2 s^{2} 2 p^{3}1s22s22p3
1s22s22p41 s^{2} 2 s^{2} 2 p^{4}1s22s22p4
1s22s22p63s11 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}1s22s22p63s1
1 s22 s22p63 s23p11 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{1}1 s22 s22p63 s23p1