Actinium (Ac)
- Atomic Number: 89
- Atomic Weight: 227
- Melting Point: 1050
- Boiling Point: 3200
- Specific Gravity: 10.07
- Valence(s): not known
Actinium was discovered in 1899 by Debierne.
Actinium is found in nature associated with Uranium ores.
This radioactive metal emits beta particles.
After radioactive decay, it emits alpha particles.
It is named after the Greek word aktinos, meaning ray.
[LM]
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