Terbium is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. Terbium is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. A measure of how difficult it is to deform a material. In the confusion, the original names got reversed, and the exchange of names stuck, so that the pink fraction referred eventually to the solution containing erbium (which in solution, is pink). The temperature at which the solid–liquid phase change occurs. This is a process where light is emitted when a crystalline solid compound is fractured, so a fracture in the crystalline lattice for example will result in the emission of bright green light that can be seen. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. It is relatively stable in air compared to the earlier, more reactive lanthanides in the first half of the lanthanide series. It has low toxicity. Mosander was Professor of Chemistry and Mineralogy at the Karolinska Institute in Stockholm, and he succeeded in showing that yttria was mainly yttrium oxide, but also contained two other oxides, terbium oxide, which is yellow in colour and erbium oxide, which is a rose pink colour. Terbium exists in two crystal allotropes with a transformation temperature of 1289 °C between them. [4] The 65 electrons of a terbium atom are arranged in the electron configuration [Xe]4f96s2; normally, only three electrons can be removed before the nuclear charge becomes too great to allow further ionization, but in the case of terbium, the stability of the half-filled [Xe]4f7 configuration allows further ionization of a fourth electron in the presence of very strong oxidizing agents such as fluorine gas. Atomic Mass and Atomic Number Worksheet - Key Name of Element Symbol Atomic Number Atomic Mass Protons Neutrons Electrons copper Cu 29 64 29 35 29 tin Sn 50 119 50 69 50 iodine I 53 127 53 74 53 uranium U 92 238 92 146 92 potassium K 19 39 19 20 19 lithium Li 3 7 3 4 3 oxygen O 8 16 8 8 8 gold Au 79 197 79 118 79 An isotope is named for its mass number. The tendency of an atom to attract electrons towards itself, expressed on a relative scale. [27], Currently, the richest commercial sources of terbium are the ion-adsorption clays of southern China; the concentrates with about two-thirds yttrium oxide by weight have about 1% terbia. The yttrofluorite variety of the mineral fluorite owes its creamy-yellow fluorescence in part to terbium. Thereafter, whenever other rare earths were teased apart from this mixture, whichever fraction gave the brown oxide retained the terbium name, until at last, the brown oxide of terbium was obtained in pure form. A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. The atomic number is the number of protons in the nucleus of an atom. 332 g/mol. It’s Elemental - The Periodic Table of Elements. This chemistry video tutorial explains how to calculate the number of protons, neutrons, and electrons in an atom or in an ion. Atomic Number: 65 Atomic Mass: 158.92534 amu Melting Point: 1360.0 °C (1633.15 K, 2480.0 °F) Boiling Point: 3041.0 °C (3314.15 K, 5505.8 °F) Number of Protons/Electrons: 65 Number of Neutrons: 94 Classification: Rare Earth Crystal Structure: Hexagonal Density @ 293 K: 8.27 g/cm 3 Color: silverish Atomic Structure Zinc-65 atom is a zinc atom in which the nucleus contains 35 neutrons. This unusual antiferromagnetism transforms into a disordered paramagnetic state at 230 K.[7], Terbium metal is an electropositive element and oxidizes in the presence of most acids (such as sulfuric acid), all of the halogens, and even water. [20], The element also has 27 nuclear isomers, with masses of 141–154, 156, and 158 (not every mass number corresponds to only one isomer). In aqueous conditions, terbium can be coordinated by nine water molecules, which are arranged in a tricapped trigonal prismatic molecular geometry. Atomic Mass or Weight Scale. Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. The element is thus mononuclidic and monoisotopic concentrated sulfuric acid to produce water-soluble sulfates rare. Found use in monitoring structural stress in aeroplane wings the elements are organised into blocks by British. 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