Chemical Elements.com - Thulium (Tm)

“Basic Information Name: 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...” (from the page’s text)

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