Symbol	Ac	Atomic radius: pm	188	Fusion: kJ/Mole	14.2
Name	Actinium	Ionic radius: pm	(+3)-	Boiling point: °C	3198
Atomic number	89	Electron affinity	-	Melting point: °C	1051
Atomic weight	227.0	1st  ion potential	5.17	Specific Heat Cap: J/(g K)	0.12
Classification	Trans metal	Natural form	Solid	Thermal Cond: W/(cm K)	-
Configuration	[Rn]6d17s2	Crystal structure	FCC	Electrical Cond	-
Oxidation states	3	Density	10.0	Abundance: mg/kg-crust	<0.001
Electronegativity	1.1	Vaporization: kJ/Mole	418.0
Actinium was first discovered in 1899 by André-Louis Debierne in pitchblende residues left after the Curies had extracted radium.			Uses -   thermoelectric power, source of neutrons