Final answer:
The incorrect statement about chromium is the electronic configuration stated in option C), as the correct configuration of chromium is [Ar] 4s¹ 3d⁵.
Step-by-step explanation:
The statement about chromium that is incorrect is: C) the electronic configuration of chromium atoms is 1s² 2s² 2p¶ 3s² 3p¶ 4s² 3d⁴. Chromium is a transition metal, and it does have an atomic number of 24. However, the correct electronic configuration of chromium atoms is [Ar] 4s¹ 3d⁵. This is due to the fact that a half-filled d manifold (having one 4s electron) is more stable than having a completely filled 4s manifold with a partially filled d manifold. Hence, statement B) correctly represents the electronic configuration of chromium, making statement C) the incorrect one.