plutonium

Name plutonium
Symbol Pu
Atomic Weight 244.06
Atomic Number 94
CAS ID 7440-07-5
Group Number
Group Name Actinoid
Period Number 7
Origin of Name After the planet "Pluto."
Year Discovered 1940
Discovery Credits Discovered by G. T. Seaborg, A. C. Wahl, and J. W. Kenndey at Berkeley, CA, USA.
Class Metallic
Color Silvery White
Standard State Solid at 77 F & 298 K
Description Radioactive silvery mental. Attacked by oxygen, steam, and acids, but not alkalis. Used as compact energy source, nuclear fuel, and for nuclear weapons.

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