# Spin quantum number

## Quantum number parameterizing spin and angular momentum / From Wikipedia, the free encyclopedia

#### Dear Wikiwand AI, let's keep it short by simply answering these key questions:

Can you list the top facts and stats about Nuclear spin?

Summarize this article for a 10 year old

In physics and chemistry, the **spin quantum number** is a quantum number (designated **s**) that describes the intrinsic angular momentum (or spin angular momentum, or simply *spin*) of an electron or other particle. It has the same value for all particles of the same type, such as s = 1/2 for all electrons. It is an integer for all bosons, such as photons, and a half-odd-integer for all fermions, such as electrons and protons.

This article may be too technical for most readers to understand. (February 2024) |

The component of the spin along a specified axis is given by the **spin magnetic quantum number**, conventionally written **m _{s}**.

^{[1]}

^{[2]}The value of m

_{s}is the component of spin angular momentum, in units of the reduced Planck constant ħ, parallel to a given direction (conventionally labelled the z–axis). It can take values ranging from +s to −s in integer increments. For an electron, m

_{s}can be either ++1/2 or −+1/2 .