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Basic InformationName: Thulium Symbol: Tm Atomic Number: 69 Atomic Mass: 168.9342 amu Melting Point: 1545.0 °C (1818.15 °K, 2813.0 °F) Boiling Point: 1727.0 °C (2000.15 °K, 3140.6 °F) Number of Protons/Electrons: 69 Number of Neutrons: 100 Classification: Rare Earth Crystal Structure: Hexagonal Density @ 293 K: 9.321 g/cm3 Color: silverish
Atomic Structure
Isotopes
FactsDate of Discovery: 1879 Discoverer: Per Theodor Cleve Name Origin: From Thule (ancient name of Scandinavia) Uses: power for portable x-ray machines Obtained From: gadolinite, euxenite, xenotime
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