A sodium atom has an electron configuration of $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$ $1s^2 2s^2 2p^6 3s^1$ . If the sodium atom becomes ionized, its new electron configuration will be the same as which element?

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Answer 1 · 2016-04-09T00:06:33

Neon.

If the sodium is ionised, the outer $3 s^{1}$ $3s^1$ electron is lost, so the configuration becomes

$1 s^{2} 2 s^{2} 2 p^{6}$ $1s^2 2s^2 2p^6$ ,

which is the same as neon, $N e$ $Ne$ .

A sodium atom has an electron configuration of 1s22s22p63s11s^2 2s^2 2p^6 3s^1. If the sodium atom becomes ionized, its new electron configuration will be the same as which element?