The rule that explain the reason for chromium to have `[Ar]3d^(5)``4s^(1)` configuration instead of `[Ar]3d^(4),4s^(2)` is

Options

A. Pauli.s exclusion principle
B. Aufbau principle
C. more exchange energy
D. Heisenberg.s principle

Answer

C

Explanation

Exchange energy is have low energy state of `4s^1 3d^5`