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Terbium,  65Tb
General properties
Name, seembol terbium, Tb
Pronunciation /ˈtɜrbiəm/ TUR-bee-əm
Appearance silvery white
Terbium in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Iron (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Copper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Silver (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercury (transeetion metal)
Thallium (post-transeetion metal)
Lead (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer 65
Staundart atomic wicht (Ar) 158.92535
Element category   lanthanide
Group, block group n/a, f-block
Period period 6
Electron configuration [Xe] 4f9 6s2
per shell
2, 8, 18, 27, 8, 2
Pheesical properties
Phase solid
Meltin pynt 1629 K ​(1356 °C, ​2473 °F)
Boilin 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 293 kJ/mol
Molar heat capacity 28.91 J/(mol·K)
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
Crystal structur hexagonal close-packed (hcp)
Hexagonal close packed crystal structure 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
Bulk modulus (α form) 38.7 GPa
Poisson ratio (α form) 0.261
Vickers haurdness 863 MPa
Brinell haurdness 677 MPa
CAS Registry Nummer 7440-27-9
Discovery Carl Gustaf Mosander (1842)
First isolation Carl Gustaf Mosander (1842)
Maist stable isotopes
Main article: Isotopes o terbium
iso NA hauf-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% - (SF) <74.878
Decay modes in parentheses are predictit, but hae nae yet been observed
· references

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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