Terbium

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Terbium
65Tb
-

Tb

Bk
gadoliniumterbiumdysprosium
Ìhànsójú
silvery white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà terbium, Tb, 65
Ìpèlóhùn /ˈtɜrbiəm/ TER-bee-əm
Ẹ̀ka ẹ́límẹ̀nti lanthanide
Ẹgbẹ́, àsìkò, àdìpò n/a6, f
Ìwúwo átọ́mù 158.92535
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 4f9 6s2
2, 8, 18, 27, 8, 2
Physical properties
Phase solid
Density (near r.t.) 8.23 g·cm−3
Liquid density at m.p. 7.65 g·cm−3
Melting point 1629 K, 1356 °C, 2473 °F
Boiling point 3503 K, 3230 °C, 5846 °F
Heat of fusion 10.15 kJ·mol−1
Heat of vaporization 293 kJ·mol−1
Molar heat capacity 28.91 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1789 1979 (2201) (2505) (2913) (3491)
Atomic properties
Oxidation states 4, 3, 2, 1
(weakly basic oxide)
Electronegativity  ? 1.2 (Pauling scale)
Ionization energies 1st: 565.8 kJ·mol−1
2nd: 1110 kJ·mol−1
3rd: 2114 kJ·mol−1
Atomic radius 177 pm
Covalent radius 194±5 pm
Miscellanea
Crystal structure hexagonal
Terbium has a hexagonal crystal structure
Magnetic ordering paramagnetic at 300 K
Electrical resistivity (r.t.) (α, poly) 1.150 µΩ·m
Thermal conductivity 11.1 W·m−1·K−1
Thermal expansion (r.t.) (α, poly) 10.3 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2620 m·s−1
Young's modulus (α form) 55.7 GPa
Shear modulus (α form) 22.1 GPa
Bulk modulus (α form) 38.7 GPa
Poisson ratio (α form) 0.261
Vickers hardness 863 MPa
Brinell hardness 677 MPa
CAS registry number 7440-27-9
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù terbium
iso NA half-life DM DE (MeV) DP
157Tb syn 71 y ε 0.060 157Gd
158Tb syn 180 y ε 1.220 158Gd
β 0.937 158Dy
159Tb 100% 159Tb is stable with 94 neutrons
· r


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