Terbium

Terbium, ₆₅Tb

Terbium
Pípè	/ˈtɜːrbiəm/ ​(TUR-bee-əm)
Ìhànsójú	silvery white
Ìwúwo átọ̀mù Ar, std(Tb)	158.925354(8)
Terbium 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 - ↑ Tb ↓ Bk gadolinium ← terbium → dysprosium
Nọ́mbà átọ̀mù (Z)	65
Ẹgbẹ́	group n/a
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f9 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 27, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1629 K ​(1356 °C, ​2473 °F)
Ígbà ìhó	3503 K ​(3230 °C, ​5846 °F)
Kíki (near r.t.)	8.23 g/cm3
when liquid (at m.p.)	7.65 g/cm3
Heat of fusion	10.15 kJ/mol
Heat of	293 kJ/mol
Molar heat capacity	28.91 J/(mol·K)
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	0, +1, +2, +3, +4 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: ? 1.2
Atomic radius	empirical: 177 pm
Covalent radius	194±5 pm
Color lines in a spectral range Spectral lines of terbium
Other properties
Natural occurrence	primordial
Crystal structure	​hexagonal
Speed of sound thin rod	2620 m/s (at 20 °C)
Thermal expansion	(r.t.) (α, poly) 10.3 µm/(m·K)
Thermal conductivity	11.1 W/(m·K)
Electrical resistivity	(r.t.) (α, poly) 1.150 µ Ω·m
Magnetic ordering	paramagnetic at 300 K
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 Number	7440-27-9
Main isotopes of terbium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 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