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.
Click on an item to paste into clipboard or use clipboard symbol at end to clipboard all values | Atomic number | 89 | | Clip | | Atomic / Molecular Weight | 227.0278 | gmol-1 | Clip | | Density | 10060 | kgm-3 | Clip | | Crystal Structure | fcc | | Clip | | Lattice constant | 531 | fm | Clip | | Melting Point | 1503 | K | Clip | | Boiling Point | 3473 | K | Clip | | Stability | Unstable | | Clip |
 paste all data into clipboard See also: Periodic Table.
  
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