Final answer:
The electron configuration [Ar] 4s2 3d3 represents the element Chromium (Cr). The neutral electron configuration of Chromium is actually [Ar] 4s1 3d5 due to the stability of a half-filled 3d manifold
Step-by-step explanation:
The electron configuration [Ar] 4s2 3d3 represents the element Chromium (Cr).
On the Periodic Table, Chromium is located in the transition metals in Group 6. The electron configuration of a neutral Chromium atom is actually [Ar] 4s1 3d5 due to the stability of a half-filled 3d manifold.
Therefore, the correct answer is D. Chromium (Cr).