Actinium
Actinium is a chemical element with the symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found in 1899 and called actinium. Actinium is a silvery radioactive metallic element. Actinium glows in the dark due to its intense radioactivity with a blue light.
Symbol: Ac
Atomic number: 89
Electron configuration: [Rn] 6d17s2
Atomic mass: 227 u
Period: period 7
Block: f-block
Melting point: 1500 K (1227 °C, 2240 °F) (estimated)
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