Plantilya:Infobox actinium

Actinium
89Ac
La ↑ Ac ↓ (Uqu) Periodic table radium ← actinium → thorium
Panagway
silvery-white
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	actinium, Ac, 89
Paglitok	/ækˈtɪniəm/ [[Help:Pronunciation respelling key|ak-Plantilya:Smallcaps all-nee-əm]]
Kategoriyang elemento	aktinido sometimes considered a transition metal
Group, period, block	3, 7, f
Gibug-aton sa atomo	(227)
Kontorno sa elektron	[Rn] 6d1 7s2 2, 8, 18, 32, 18, 9, 2 Electron shells of actinium (2, 8, 18, 32, 18, 9, 2)
History
Pagkadiskobre	André-Louis Debierne (1899)
First isolation	André-Louis Debierne (1899)
Physical properties
Phase	magahi
Density (near r.t.)	10 g·cm−3
Melting point	(circa) 1323 K, 1050 °C, 1922 °F
Boiling point	3471 K, 3198 °C, 5788 °F
Heat of fusion	14 kJ·mol−1
Heat of vaporization	400 kJ·mol−1
Molar heat capacity	27.2 J·mol−1·K−1
Atomic properties
Oxidation states	3 (neutral oxide)
Electronegativity	1.1 (Pauling scale)
Ionization energies	1st: 499 kJ·mol−1
	2nd: 1170 kJ·mol−1
Covalent radius	215 pm
Miscellanea
Crystal structure	face-centered cubic
Magnetic ordering	no data
Thermal conductivity	12 W·m−1·K−1
CAS registry number	7440-34-8
Most stable isotopes
Main article: Isotopes of actinium
iso NA half-life DM DE (MeV) DP 225Ac trace 10 d α 5.935 221Fr 226Ac syn 29.37 h β− 1.117 226Th ε 0.640 226Ra α 5.536 222Fr 227Ac trace 21.772 y β− 0.045 227Th α 5.042 223Fr