Final answer:
The correct ground state electron configuration for chromium is [Ar] 4s1 3d5 (Option A). In the case of chromium, one electron from the 4s orbital moves to the 3d orbital, resulting in an electron configuration of [Ar] 4s1 3d5.
Step-by-step explanation:
The correct ground state electron configuration for chromium is [Ar] 4s1 3d5 (Option A).
Chromium belongs to the d-block on the periodic table and has an atomic number of 24.
The electron configuration is determined by filling the orbitals in order of increasing energy level.
In the case of chromium, one electron from the 4s orbital moves to the 3d orbital, resulting in an electron configuration of [Ar] 4s1 3d5.