Which is the electron configuration for zinc?

Zinc has atomic number 30, so a neutral zinc atom has 30 electrons. Filling the orbitals gives [Ar] 4s² 3d¹⁰, or 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰. This matches choice A; the other choices have the wrong number of electrons in one or more orbitals.

AI-written and checked against the verified answer.