Which excited state element could have an electron configuration of $1s^2 2s^2 2p^6 3s^2 3p^4 4s^1$ ?

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Answer 1 · 2016-01-12T02:19:10

The element is chlorine.

The element is "excited", so it still has all its electrons.

The element contains 17 electrons.

It must be element with atomic number 17: chlorine.

Which excited state element could have an electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^4 4s^11s^2 2s^2 2p^6 3s^2 3p^4 4s^1?