Actinium element has 89 protons, 138 neutrons and 89 electrons.
Actinium is a soft silvery metal at room temperature. The melting point of Actinium metal is 1050 ̊C.
It's radioactive. Actinium cation is Ac+3.
» Common Actinium compounds:
• Actinium(III) Oxide, Ac2O3
• Actinium Chloride, AcCl3
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