Exceptions to ________ are represented by chromium and copper in the 4th row of the periodic table.
A)the Aufbau Principle
B)Hund's Rule
C)the Bohr Theory
D)the Heisenberg Principle
E)the Pauli Exclusion Principle

Question

Quizplus · Accepted Answer

Chromium and copper are exceptions to the Aufbau Principle because they have electron configurations that do not follow the expected order. In chromium, one electron from the 4s orbital is used to half-fill the 3d orbital, and in copper, one electron from the 4s orbital is used to completely fill the 3d orbital, leading to more stable configurations.

Exceptions to ________ Are Represented by Chromium and Copper in the 4th