Yttrium
From Citizendium, the Citizens' Compendium
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Yttrium is a chemical element, having the chemical symbol Y. Its atomic number (the number of protons) is 39. It has a Standard Atomic Weight of 88.91, and is typically found as a solid in its elemental form.
Yttrium is considered to be a member of the "Rare Earth" family of elements, and has a boiling point of 3345°C.

