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Which of the following elements has its valence electrons...

Which of the following elements has its valence electrons in the s-orbital?

A.

Aluminum

B.

Phosphorus

C.

Sodium

D.

Carbon

View answer & explanation

Correct answer is C

Sodium is an alkali metal, and its atomic number is 11. This means that it has 11 electrons, and its electron configuration is $1s^2 2s^2 2p^6 3s^1$ . The valence electrons are the electrons in the outermost shell, which in this case is the 3s orbital.

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