Chemical Elements.com - Erbium (Er)

“Basic Information Name: Erbium Symbol: Er Atomic Number: 68 Atomic Mass: 167.26 amu Melting Point: 1522.0 °C (1795.15 K, 2771.6 °F) Boiling Point: 2510.0 °C (2783.15 K, 4550.0 °F) Number of Protons/Electrons: 68 Number of Neutrons: 99 Classification: Rare Earth Crystal Structure: Hexagonal Density...” (from the page’s text)

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