Promethium

Promethium is a rare earth element and is one of the few elements that is radioactive and does not have stable isotopes.

Atomic Structure

promethium atom electronic configuration

Atomic Information

Property	Value
Atomic Number	61
Symbol	Pm
Atomic Mass	145 u
Electron Configuration	[Xe] 4f⁵ 6s²
State at Room Temperature	Solid

Uses of Promethium

Used in atomic batteries to power spacecraft and medical devices.
Can be used as a phosphor in certain types of lighting.