Chlorine, KLAWR een, is a poisonous, yellowish-green gas with a strong, unpleasant odor. Chlorine causes irritation to the nose, throat, and lungs. However, when combined with the metal sodium, chlorine forms sodium chloride, or table salt.
Noble gas refers to any of a group of six chemical elements. These elements are argon (Ar), helium (He), krypton (Kr), neon (Ne), radon (Rn), 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>>
Argon
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