Electronic data		Thermal data		Steric data
Shells: 2,8,18,32,18,9,2 Orbitals: [Rn] 6d1 7s2 Electronegativity: 1.0, -- 1. Ionization potential: 5.17 eV 2. Ionization potential: 12.126 eV 3. Ionization potential: -- eV Oxidation states: 3 Electrical conductivity: --		Melting point: 1050 °C Boiling point: 3200 °C ±300 Specific heat: -- J/gK Heat of fusion: -- kJ/mol Heat of vaporization: -- kJ/mol Thermal conductivity: 0.12 W/cmK		Atomic radius: -- Å Ionic radius: -- Å () Covalent radius: -- Å Atomic volume: 22.54 cm³/mol Density (293 K): 10.07 g/cm³ Crystal structure: Cubic: Face centered

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Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
225Ac	0	225.023	0	10.0d		View
227Ac	0	227.028	3/2	21.77y	-,	View
228Ac	0	228	3	6.15h	-	View

Legend

Name origin:	Greek: akis, aktinos (ray).
Description:	Heavy, silvery-white, very radioactive metal
Discovered by:	André Debierne
Year:	1899
Place:	France
Sources:	Extremely rare, found in all uranium ores. Usually obtained by treating radium with neutrons in a reactor.
Use(s):	It has no significant commercial applications.