- 1s22s22p63s23p41s^22s^22p^63s^23p^4.
- 1s22s22p63s23p21s^22s^22p^63s^23p^2.
- 1s22s22p63s23p61s^22s^22p^63s^23p^6.
- 1s22s22p63s23p51s^22s^22p^63s^23p^5.