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Actinium

A radioactive element. The name derives from the Greek, aktis or akinis for "beam or ray" because it is a powerful source of alpha radiation.


Symbol
Ac

Discovered
Discovered by the French chemist Andre-Louis Debierne in 1899 and independently discovered by German chemist Friedrich Oskar Giesel in 1902, who called it emanium.

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Atomic number 89 Clip
Atomic / Molecular Weight 227.0278 gmol-1Clip
Density 10060 kgm-3Clip
Crystal Structure fcc Clip
Lattice constant 531 fmClip
Melting Point 1503 KClip
Boiling Point 3473 KClip
Stability Unstable Clip
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See also: Periodic Table.

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