Tóríọ̀m

Thorium
90Th
Ce ↑ Th ↓ (Uqn) Tábìlì ìdásìkò actinium ← thorium → protactinium
Ìhànsójú
silvery white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	thorium, Th, 90
Ẹ̀ka ẹ́límẹ̀nti	actinide
Ẹgbẹ́, àsìkò, àdìpò	n/a, 7, f
Ìwúwo átọ́mù	232.0381
Ìtòléra ẹ̀lẹ́ktrónì	[Rn] 6d2 7s2 2, 8, 18, 32, 18, 10, 2
Physical properties
Phase	solid
Density (near r.t.)	11.7 g·cm−3
Melting point	2115 K, 1842 °C, 3348 °F
Boiling point	5061 K, 4788 °C, 8650 °F
Heat of fusion	13.81 kJ·mol−1
Heat of vaporization	514 kJ·mol−1
Molar heat capacity	26.230 J·mol−1·K−1
Vapor 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	4, 3, 2 (weakly basic oxide)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 587 kJ·mol−1
	2nd: 1110 kJ·mol−1
	3rd: 1930 kJ·mol−1
Atomic radius	179 pm
Covalent radius	206±6 pm
Miscellanea
Crystal structure	face-centered cubic
Magnetic ordering	paramagnetic
Electrical resistivity	(0 °C) 147 nΩ·m
Thermal conductivity	54.0 W·m−1·K−1
Thermal expansion	(25 °C) 11.0 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 2490 m·s−1
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 registry number	7440-29-1
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù thorium
iso NA half-life DM DE (MeV) DP 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.