Erbium
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Erbium is a chemical element, having the chemical symbol Er.
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Its atomic number (the number of protons) is 68. It has a Standard Atomic Weight of 167.259(3), and is typically found as a solid in its elemental form.
Erbium is considered to be a member of the "Lanthanide" class of elements, has a boiling point of 2,868 °C , and a melting point of 1,529 °C .