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Argon, AHR gon, is a chemical element that forms 0.94 percent of Earth's atmosphere. Most ordinary light bulbs are filled with argon and a little nitrogen. Argon is also used as a shielding gas in arc welding to protect the metal from oxygen in the air. Lord Rayleigh and Sir William Ramsay discovered it in 1894. See Ramsay, Sir William; Rayleigh, Lord.
Krypton, KRIHP ton, is a chemical element that makes up only about one-millionth of Earth's atmosphere. The British chemists Sir William Ramsay and… More>>
Fluorine, FLOO uh reen, is a chemical element. At ordinary temperatures, it is a pale yellow gas. Fluorine combines with other elements more… More>>
Argon, AHR gon, is a chemical element that forms 0.94 percent of Earth's atmosphere. Most ordinary light bulbs are filled with argon and a little… More>>
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