Àdàkọ:Infobox actinium

Actinium, ₈₉Ac

Actinium
Pípè	/ækˈtɪniəm/ ​(ak-TIN-ee-əm)
Ìhànsójú	silvery
nọ́mbà ìsújọ	[227]
Actinium ní orí tábìlì àyè
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson La ↑ Ac ↓ Ute radium ← actinium → thorium
Nọ́mbà átọ̀mù (Z)	89
Ẹgbẹ́	group 3
Àyè	àyè 7
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Actinide
Ìtò ẹ̀lẹ́ktrọ́nù	[Rn] 6d1 7s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 18, 9, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	(circa) 1323 K ​(1050 °C, ​1922 °F)
Ígbà ìhó	3471 K ​(3198 °C, ​5788 °F)
Kíki (near r.t.)	10 g/cm3
Heat of fusion	14 kJ/mol
Heat of	400 kJ/mol
Molar heat capacity	27.2 J/(mol·K)
Atomic properties
Oxidation states	+3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.1
Covalent radius	215 pm
Color lines in a spectral range Spectral lines of actinium
Other properties
Natural occurrence	from decay
Crystal structure	​(fcc)
Thermal conductivity	12 W/(m·K)
Magnetic ordering	no data
CAS Number	7440-34-8
Main isotopes of actinium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 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