Po Polonium 84 (209) 16 6 p 84 254.0 962.0 [Xe] 6s2 4f14 5d10 6p4 2 8 18 32 18 6 9.32 N/A Silver Monoclinic 2.0 2.19 {"1":"812.1"} 821 183.3 176 +4,2 1.67 22.7 13.0 120.0 20.0 1 102.1 y 147.1y AlphaEmission Solid, Conductor, Metal, Radioactive, Natural, Metalloid peh-LOW-ni-em Silvery-gray, extremely rare, radioactive metal. Used in industrial equipment that eliminates static electricity caused by such processes as rolling paper, wire, and sheet metal. Occurs in pitchblende from decay of bismuth. bbr5yWwsI1o Polonium

Thulium was discovered by Swedish chemist Per Teodor Cleve in 1879 by looking for impurities in the oxides of other rare earth elements.

The first researcher to obtain nearly pure thulium was Charles James, a British expatriate working on a large scale at New Hampshire College in Durham.

High-purity thulium oxide was first offered commercially in the late 1950s. Named after Thule, the earliest name for Scandinavia 84 1898 Marie Curie France Named after "Poland" (birthplace of Marie Curie)

Thulium is considered to be non-toxic

Thulium ore occurs most commonly in China

Thulium is used to dope yttrium aluminum garnets used in lasers.

It has also been used in high-temperature superconductors similarly to yttrium.

Thulium has use in ferrites, ceramic magnetic materials that are used in microwave equipment.

Thulium is used in euro banknotes for its blue fluorescence under UV light to defeat counterfeiters.