Plutonium

Atomic symbol: Pu
Atomic number: 94
Atomic mass: 244

Appearance: Silvery gray solid at 25°C

Group: N/a Period: 7
Series: Actinides
Block: f
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f⁶ 7s²

Radioactive metal used in nuclear fuels.

Fun Fact! Plutonium-244 has an incredibly long half-life of 82 million years!

https://www.livescience.com/39871-facts-about-plutonium.html#:~:text=It%20has%20a%20half%2Dlife,named%20after%20the%20planet%20Neptune.