Krypton
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Krypton is a chemical element, having the chemical symbol Kr.
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Its atomic number (the number of protons) is 36. It has a Standard Atomic Weight of 83.798(2), and is typically found as a gas in its elemental form.
Krypton is considered to be a member of the "Noble gas" class of elements, has a boiling point of -153.22 °C , and a melting point of -157.38 °C .