Tóríọ̀m

Thorium, ₉₀Th

Thorium
Pípè	/ˈθɔːriəm/ ​(THOR-ee-əm)
Ìhànsójú	silvery white
Ìwúwo átọ̀mù Ar, std(Th)	232.0377(4)
Thorium 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 Ce ↑ Th ↓ (Uqn) actinium ← thorium → protactinium
Nọ́mbà átọ̀mù (Z)	90
Ẹgbẹ́	group n/a
Àyè	àyè 7
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Actinide
Ìtò ẹ̀lẹ́ktrọ́nù	[Rn] 6d2 7s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 18, 10, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	2115 K ​(1842 °C, ​3348 °F)
Ígbà ìhó	5061 K ​(4788 °C, ​8650 °F)
Kíki (near r.t.)	11.7 g/cm3
Heat of fusion	13.81 kJ/mol
Heat of	514 kJ/mol
Molar heat capacity	26.230 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2633 2907 3248 3683 4259 5055
Atomic properties
Oxidation states	+1, +2, +3, +4 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.3
Atomic radius	empirical: 179 pm
Covalent radius	206±6 pm
Spectral lines of thorium
Other properties
Natural occurrence	primordial
Crystal structure	​(fcc)
Speed of sound thin rod	2490 m/s (at 20 °C)
Thermal expansion	11.0 µm/(m·K) (at 25 °C)
Thermal conductivity	54.0 W/(m·K)
Electrical resistivity	147 n Ω·m (at 0 °C)
Magnetic ordering	paramagnetic
Young's modulus	79 GPa
Shear modulus	31 GPa
Bulk modulus	54 GPa
Poisson ratio	0.27
Mohs hardness	3.0
Vickers hardness	350 MPa
Brinell hardness	400 MPa
CAS Number	7440-29-1
Main isotopes of thorium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 228Th trace 1.9116 years α 5.520 224Ra 229Th syn 7340 years α 5.168 225Ra 230Th trace 75380 years α 4.770 226Ra 231Th trace 25.5 hours β 0.39 231Pa 232Th 100% 1.405×1010 years α 4.083 228Ra 234Th trace 24.1 days β 0.27 234Pa

Tóríọ̀m tabi Thorium je apilese kemika to ni ami-idamo Th ati nomba atomu 90.

Thorium je onide alagbararadio to sele ladanida.