Thulium

 Thulium

1. Name of the element and how it got its name a. Who discovered it? Per Theodor Cleve discovered Thulium. b. When it was discovered? Discovered in 1879. c. How it got its name? From Thule (ancient name of Scandinavia). 2. Symbol, Atomic number, and Atomic mass a. Source of symbol? Symbol is the first and last letter of name. b. Atomic number- 69 c. Atomic mass- 168.9342 amu 3. Number of protons ,electrons and neutrons a. #of protons-69 b. #of electrons-69 c. # of neutrons-100 4. Where it is found most (land, air, water) and in what form (solid, liquid, gas). a. It is found most on land and in solid form. 5. Physical facts: a. Melting point- 1545.0 °C b. Boiling point- 1727.0 °C c. Density-9.321 g/mL or 9.321 g/cm 3 d. Abundance in the earth’s crust (crust includes air, water, and land) Extremely rare. 6. Uses (how is this element used)- Thulium is used in portable x-ray machines, lasers, and 7. Interesting facts- Discovered in Sweden. Color is sliverish 8. Sources- for info.  ([])

