Àktíníọ̀m

Actinium
89Ac
La ↑ Ac ↓ Ute Tábìlì ìdásìkò radium ← actinium → thorium
Ìhànsójú
silvery
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	actinium, Ac, 89
Ẹ̀ka ẹ́límẹ̀nti	actinide
Ẹgbẹ́, àsìkò, àdìpò	n/a, 7, f
Ìwúwo átọ́mù	(227)
Ìtòléra ẹ̀lẹ́ktrónì	[Rn] 6d1 7s2 2, 8, 18, 32, 18, 9, 2
Physical properties
Phase	solid
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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù actinium
iso NA half-life DM DE (MeV) DP 225Ac syn 10 days α 5.935 221Fr 226Ac syn 29.37 hours β− 1.117 226Th ε 0.640 226Ra α 5.536 222Fr 227Ac 100% 21.773 years β− 0.045 227Th α 5.042 223Fr

Àktíníọ̀m tabi Actinium je is a radioactive apilese kemika alagbararadio to ni ami-idamo Ac ati nomba atomu 89, to je wiwari ni odun 1899.