Krypton
From Citizendium, the Citizens' Compendium
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Krypton is a chemical element, having the chemical symbol Kr. Its atomic number (the number of protons) is 36. It has a Standard Atomic Weight of 83.798, and is typically found as a gas in its elemental form.
Krypton is considered to be a member of the "Noble Gas" family of elements, and has a boiling point of -153.22°C.

