# Chapter 8 - Exercises - Page 376: 42

C : $1s^22s^22p^2$ P : $1s^22s^22p^63s^23p^3$ Ar : $1s^22s^22p^63s^23p^6$ Na : $1s^22s^22p^63s^1$

#### Work Step by Step

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)

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