1. Education

Discuss in my forum

Quantum Number Definition

Chemistry Glossary Definition of Quantum Number

By

Definition: A number used when describing the energy levels available to atoms and molecules. An electron in an atom or ion has four quantum numbers to describe its state.

There are four quantum numbers:

n - describes the energy level
ℓ - describes the subshell
m - describes the orbital of the subshell
ms - describes the spin

Return to the Chemistry Glossary Index

©2014 About.com. All rights reserved.