Erbium

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Erbium is a chemical element, having the chemical symbol Er. Its atomic number (the number of protons) is 68. It has a standard atomic weight of 167.259 g•mol ⁻¹ and is a solid in its elemental form.

Erbium is considered a member of the "Lanthanide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 2,868 °C and a melting point of 1,529 °C.