## Chemistry: Molecular Approach (4th Edition)

C : $1s^22s^22p^2$ P : $1s^22s^22p^63s^23p^3$ Ar : $1s^22s^22p^63s^23p^6$ Na : $1s^22s^22p^63s^1$
The electronic configurations are: C : $1s^22s^22p^2$ (6 electrons) P : $1s^22s^22p^63s^23p^3$ (15 electrons) Ar : $1s^22s^22p^63s^23p^6$ (18 electrons) Na : $1s^22s^22p^63s^1$ (11 electrons)