1 s22 s22p51 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{5}1 s22 s22p5
1s22s22p63s11 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}1s22s22p63s1
1s22s22p41 s^{2} 2 s^{2} 2 p^{4}1s22s22p4
1s22s22p63s22p51 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 2 p^{5}1s22s22p63s22p5