# Which elements have the following electron configurations? [Ar]4s23d8 [Ar]4s23d104p3 [He]2s22p6...

## Question:

Which elements have the following electron configurations?

(A) {eq}\left [ Ar \right ]3d^{8}4s^{2} {/eq}

(B) {eq}\left [ Ar \right ]3d^{10}4s^{2}4p^{3} {/eq}

(C) {eq}\left [ He \right ]2s^{2}2p^{6} {/eq}

(D) {eq}\left [ He \right ]2s^{2} {/eq}

## Electronic Configuration:

If we know the electronic configuration of an element and we need to know the element whose electronic configuration has been given, then we can do so by knowing the number of protons of that atom.

The number of protons helps us to know the atomic number, which in turn helps us to know the element.