Periodic Table of the Elements
Periodic Table




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name Actinium
latin Actinium
french Actinium
german Actinium
symbol Ac
proton number 89
atomic weight 227.0278
Pauling electronegativity 1.1
electronic configuration [Rn] 6d17s2
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melting point 1323 K, 1050°C, 1922°F
boiling point 3573 K, 3300°C, 5972°F
group 3
period 7
state (by 20°C) solid
oxidation states +3
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Year of discovery Discoverer
1899 Andre Debierne

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