Holmium

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Holmium is a chemical element, having the chemical symbol Ho. Its atomic number (the number of protons) is 67. It has a standard atomic weight of 164.9303 g•mol ⁻¹ and is a solid in its elemental form.

Holmium is considered a member of the "Lanthanide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 2,700 °C and a melting point of 1,474 °C.