Four electronic configurations are given below. Three of these configurations are for atoms of the elements chlorine, sodium and vanadium. Which electronic configuration is for an atom of a different element?
- A$1s^22s^22p^63s^1$
- B$1s^22s^22p^63s^23p^5$
- C$1s^22s^22p^63s^23p^63d^34s^2$
- D$1s^22s^22p^63s^23p^63d^64s^2$