Terbium

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Terbium,  65Tb
Terbium-2.jpg
General properties
Appearance silvery white
Staundart atomic wecht (Ar, staundart) 158.92535(2)
Terbium in the periodic cairt
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 Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) 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 Mercur (element) Thallium Leid (element) 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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
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Tb

Bk
gadoliniumterbiumdysprosium
Atomic nummer (Z) 65
Group group n/a
Period period 6
Element category   lanthanide
Block f-block
Electron confeeguration [Xe] 4f9 6s2
Electrons per shell
2, 8, 18, 27, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1629 K ​(1356 °C, ​2473 °F)
Bylin pynt 3503 K ​(3230 °C, ​5846 °F)
Density (near r.t.) 8.23 g/cm3
when liquid (at m.p.) 7.65 g/cm3
Heat o fusion 10.15 kJ/mol
Heat o vapourisation 293 kJ/mol
Molar heat capacity 28.91 J/(mol·K)
Vapour pressur
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 Pauling scale: ? 1.2
Atomic radius empirical: 177 pm
Covalent radius 194±5 pm
Color lines in a spectral range
Miscellanea
Creestal structurhexagonal close-packed (hcp)
Hexagonal close packed creestal structur for terbium
Speed o soond 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 orderin paramagnetic at 300 K
Young's modulus (α form) 55.7 GPa
Shear modulus (α form) 22.1 GPa
Bouk modulus (α form) 38.7 GPa
Poisson ratio (α form) 0.261
Vickers haurdness 863 MPa
Brinell haurdness 677 MPa
CAS Nummer 7440-27-9
History
Diskivery Carl Gustaf Mosander (1842)
First isolation Carl Gustaf Mosander (1842)
Main isotopes o terbium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
157Tb syn 71 y ε 157Gd
158Tb syn 180 y ε 158Gd
β 158Dy
159Tb 100% - (SF)
Decay modes in parentheses are predictit, but hae nae yet been observed
| references | in Wikidata

Terbium is a chemical element wi the seembol Tb an atomic nummer 65. It is a sillery-white rare yird metal that is malleable, ductile an saft enough tae be cut wi a knife. Terbium is never foond in naitur as a free element, but it is contained in mony minerals, includin cerite, gadolinite, monazite, xenotime an euxenite.

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