Ytterbium
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Ytterbium is a chemical element, having the chemical symbol Yb.
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Its atomic number (the number of protons) is 70. It has a Standard Atomic Weight of 173.04(3), and is typically found as a solid in its elemental form.
Ytterbium is considered to be a member of the "Lanthanide" class of elements, has a boiling point of 1,196 °C , and a melting point of 819 °C .