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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SPECIFICATION
Index name
Spec
Appearance
White crystalline Powder
Assay, %
99.0-100.5
Melting Point,℃
96-98
Residue on Ignition,% ≤0.1
Sulphated Ash %
≤0.05
Related Substances % ≤0.5
HeavyMetal (Pb) ppm ≤10
Loss on Drying %
0.5
Residual Solvents ppm ≤3000 -
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