Tb occurs as chemical element in the periodic table that has the symbol Tb & atomic number 65.

Notable characteristics
Atomic number 65 occurs as silvery-silver-grey rare earth metal that is malleable, ductile and easy plenty to become cut sustaining the knife. These are reasonably stable inside air, & ii crystal allotropes exist, with the transformation temperature of 1289 °C.

Applications
Tb is utilized to dope calcium_fluoride, calcium tungstate and strontium molybdate, materials that are utilized around firm-state hardware, & as a crystal stabilizer of fuel cells which work at elevated temperatures, together by having ZrO₂. Atomic number 65 is as well utilized within alloys and in the production of electronic equipment, its oxide is used around green phosphors in fluorescent lamps and color TV tubes. Sodium terbium borate is used inside solid state devices.

History
Atomic number 65 was found around 1843 by Swedish chemist Carl Gustaf Mosander, world health organization found it as an impurity inside Yttrium-oxide, Y₂O_Leash, & known as when a village Ytterby in Sweden. It was non isolated within pure form until a recent advent of ion exchange techniques.

Occurrence
Tb is never witnessed around nature and severity when a loose element, however these are contained inside numerous minerals, including cerite, gadolinite, monazite ((Ce,LaTh,Nd,Y)PO₄, which contains as much as Zero.03% of Tb), xenotime (YPO₄) & euxenite ((Y,Ca,Er,La,Ce,U,Th)(Nb,Ta,Ti)₂O_{Half a dozen}, which contains 1% or even thomas more of Atomic number 65).

Compounds
Tb compounds include:

Fluorides TbF₃ TbF₄ Chlorides TbCl₃ Bromides TbBr₃ Iodides TbI₃ Oxides Tb₂O₃ Tb₄O₇ Sulfides Tb₂S₃ Nitrides TbN

Isotopes
Naturally occurring Atomic number 65 is composed of I stable isotope, 159-Tb. 33 radioisotopes have been characterized, sustaining the virtually all horse barn existence 158-Tb with a half-life of 180 years, 157-Tb using the half-life of 71 years, & 160-Tb with the half-life of 72.Three years. Completely of the leftover radioactive isotopes have half-lifes that come less than Captain hicks.907 years, & a majority one stand half lifes that come less than Two dozen seconds. This element too has Xviii meta states, with a virtually all horse barn existence 156m1-Tb (t_½ Twenty-four.Four hours), 154m2-Tb (t_½ Xxii.Sevener hours) & 154m1-Tb (t_½ Ix.Quartet hours).

A primary decay mode before the virtually all abundant stable isotope, 159-Tb, is electron capture, and a primary mode fallowing is beta minus decay. A primary decay products before 159-Tb come element Gd (Gadolinium) isotopes, and a primary products fallowing come element Dy (Dysprosium) isotopes.

Precautions
When by owning a more rcome earth, atomic number 65 compounds are of great to moderate toxicity, although their toxicity has non been investigated inside detail. Tb has there is no known biological role.