Thulium is a chemical element; it has symbol Tm and atomic number 69. It is the thirteenth element in the lanthanide series of metals. It is the second-least abundant lanthanide in the Earth's crust, after radioactively unstable promethium. It is an easily workable metal with a bright silvery-gray luster.

Element Thulium (Tm), Group 19, Atomic Number 69, f-block, Mass 168.934. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Thulium (Tm), chemical element, a rare-earth metal of the lanthanide series of the periodic table. Thulium is a moderately hard, silvery white metal that is stable in air but can easily be dissolved in diluted acids—except hydrofluoric acid (HF), in which an insoluble trifluoride (TmF3) layer forms

Thulium (pronounced as Thoo-lee-em) [2] is a soft, silver-gray rare earth metal [3] belonging to the Lanthanides group and represented by the symbol Tm [1]. While its most abundant, naturally occurring isotope is 169 Tm, it has 34 radioactive isotopes, out of which the most stable one is 171 Tm with a half-life period of 1.92 years [4] .

Thulium is a chemical element with an atomic number 69. It is the 13th element in the lanthanide series. Learn its application, properties and uses @Byju's.

2024年7月2日 · Thulium (Tm) is a rare earth element, part of the lanthanide series and f-block in the periodic table. Its atomic number is 69 and its element symbol is Tm. Most of the rare earths are not all that uncommon, but thulium truly is rare.

Thulium was discovered in 1879. It is slowly tarnished in air but is more resistant to oxidation than other rare earth metals. Thulium is used as radiation source in portable X-ray devices.

Thulium is a chemical element with symbol Tm and atomic number 69. Classified as a lanthanide, Thulium is a solid at room temperature. [Xe]6s 2 4f 13. J.C. Slater, J Chem Phys, 1964, 41 (10), 3199-3205. DOI:10.1063/1.1725697.

2021年10月14日 · thulium is a mineral. An element of the rare earth family of metals. It has the atomic symbol Tm, atomic number 69, and atomic weight 168.93. See also: ... View More ... COD records with this CID as component. Malleable, silver -white metal; [Merck Index]

Thulium is the least abundant of the rare earth elements, but with new sources recently discovered, it is now considered to be about as rare as silver, gold, or cadmium. Thulium can be isolated by reduction of the oxide with lanthanum metal or by calcium reduction of a …