Krypton is a chemical element. It is atomic number 36 on the periodic table and has an atomic mass of 83.80. This gas was discovered by Humans for the first time on Earth in Great Britain in the year 1898. (ST reference: Star Fleet Medical Reference Manual)

In 2267, the USS Enterprise found the atmosphere of Neolithia breathable, an oxygen-nitrogen mixture, with traces of argon, krypton, and neon. (TOS novel: Mission to Horatius)

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