The electron configuration of sodium (atomic number 11) in its ground state is

Question

Accepted Answer

$1s^2 2s^2 2p^6 3s^1$. Electrons fill in order of increasing energy: 2 in 1s, 2 in 2s, 6 in 2p (the maximum for a p subshell), and the eleventh goes into 3s. A 2p subshell can never hold 7 electrons and an s subshell never holds 3.

Answer

A) $1s^2 2s^3 2p^6$

Answer

B) $1s^2 2s^2 2p^7$

Answer

C) $1s^2 2s^2 2p^5 3s^2$

Answer

D) $1s^2 2s^2 2p^6 3s^1$

The electron configuration of sodium (atomic number 11) in its ground state is

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