Question

What is the basis for exceptions to the aufbau principle

Answer 1

With every electron stationed in its own orbital or paired off with each other in the higher energy level, the energy level is balanced and stable. The atoms that utilize this exception are Molybdenum, Chromium, Gold, Silver, and Copper.

Answer 2

Step-by-step explanation:

This principles determines the manner in which atomic orbitals of an element filled with electrons. According to the principle, orbitals are filled by electrons on the basis of increasing order of orbital energy level. It can be used to determine the location of electrons in an atom.

However, chromium, silver, etc. are the exception because of the increased stability provided by the half-filled or filled sub-shells and also due to the presence of energy gap between the sub-shells.