Determine the identity of the element that contains exactly three 4p electrons in the ground state

Arsenic (As)

Explanation:

The electron configuration of arsenic is; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 or [Ar]4s2 3d10 4p3 for short.

Arsenic is a group 15 element. All group 15 elements have outermost electron configuration of ns^2 np^3. Arsenic is the only member of the group that possesses exactly three electrons in the 4p orbital.

Hence As is the element we need to identity in the question.

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