Terbium Element in Periodic Table | Atomic Number Atomic Mass

Terbium

Terbium Element:

Terbium is a chemical element placed in the lanthanide series of periodic table. Its atomic number is 65 and is represented by the symbol Tb. Like most of lanthanide elements, Tb is a silvery white solid metal at standard conditions of temperature and pressure. It melts at 1356 °C and boils at 3123 °C. It is ductile, malleable and under STP terbium is so soft that it can be cut with a knife like its congeners in the same period. Tb  is not found in a free state in nature but is present in its minerals like cerite, gadolinite, monazite, xenotime, euxenite etc.

Compared to its predecessors in the lanthanide series, terbium is less reactive in open air. Under elevated temperatures, terbium reacts with oxygen to form terbium oxide, exhibiting its +3 and +4 oxidation states, in the form of Tb2O3 and Tb4O7. With cold water, terbium reacts slowly but it reacts quickly with hot water to form terbium hydroxide Tb (OH)3, releasing hydrogen gas. Tb reacts with all halogens to form respective terbium trihalides, TbX3 where X stands for halogen atom.

Terbium exhibits oxidation states +3 and sometimes +2, when it reacts with non-metals (and also  a few post-transition metals) like hydrogen, boron, sulfur, selenium, tellurium and nitrogen to form binary compounds such as TbH2, TbH3, TbB2, Tb2S3, TbSe, TbTe and TbN.

Tb  has only one naturally occurring isotope 159Tb. The other 36 artificial isotopes have been synthesized, out of which the heaviest isotope is determined as possessing the heaviest atomic mass of 171units. Terbium is also found to exist in 27 nuclear isomeric forms.

Uses Of Terbium Element:

Terbium is used as a dopant in calcium fluoride, calcium tungstate and strontium molybdate which are used in solid-state devices. It is also used in low-energy light bulbs and mercury vapour lamps. It  is also helpful in shortening the duration of exposure to X-ray scanning without compromising with the quality of image in the X-ray film. Terbium salts are used laser devices.

Terbium

Terbium Element Information:

Discovery year:1842

Discovered by: Carl Gustaf Mosander

Atomic number: 65

Relative atomic mass: 158.925 

Electron configuration: [Xe] 4f9 6s2

Block: f-block

Other elements in the same block:

Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and  Lawrencium are the elements in the same block.

Period: period 6

Other elements in the same period:

Caesium, Barium, LanthanumCerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Hafnium, Tantalum, Tungsten, Rhenium, Osmium, Iridium, Platinum, Gold, Mercury, Thallium, Lead, Bismuth, Polonium, Astatine and Radon

Group: Lanthanides

Other elements in the same group:

Cerium, praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium.

Other elements in the same orbital:

LanthanumCerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium and Lutetium are the elements in the same orbital.

Allotropes: none

Key isotopes: 159Tb 

Melting point: 1359°C, 2478°F, 1632 K 

Boiling point: 3230°C, 5846°F, 3503 K 

Element category:  lanthanide

Density (g cm−3): 8.23

CAS number: 7440-27-9

Color: silvery white

You can know detailed information for each element,

Hydrogen, HeliumLithiumBerylliumBoronCarbonNitrogenOxygenFluorine,  Neon , SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon, PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromine, Krypton,  Rubidium, StrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodine, Xenon,  Caesium, BariumLanthanum,  CeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercuryThalliumLeadBismuthPoloniumAstatine, Radon,  Francium, RadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessine, Oganesson.

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