Krypton
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Krypton is a chemical element; it has symbol Kr and atomic number 36. It is a colorless, odorless noble gas that occurs in trace amounts in the atmosphere and is often used with other rare gases in fl
A krypton-filled discharge tube glowing white
Sir William Ramsay, the discoverer of krypton
Kr(H2)4 and H2 solids formed in a diamond anvil cell
Krypton gas discharge tube
Argon
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Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third most abundant gas in Earth's atmosphere, at 0.934%. I
Krypton
…with krypton bonded to atoms other than fluorine have also been discovered. There are also unverified reports of a barium salt of a krypton oxoacid. ArKr+ and KrH+ polyatomic ions have been investigated and there is evidence for KrXe or KrXe+. The reaction of KrF2 with B(OTeF5)3 produces an unstable…
Argon discharge tube
A small piece of rapidly melting solid argon
Captioned "Argon", caricature of Lord Rayleigh in Vanity Fair, 1899
Cylinders containing argon gas for use in extinguishing fire without damaging server equipment