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Unformatted text preview: Al Barium Ba Calcium Ca Chlorine Cl Helium He Magnesium Mg Platinum Pt Silicon Si Copper Cu (from cuprum ) Iron Fe (from ferrum ) Lead Pb (from plumbum ) Mercury Hg (from hydrargyrum ) Potassium K (from kalium ) Silver Ag (from argentum ) Sodium Na (from natrium ) Tin Sn (from stannum ) Compounds Compounds are substances of two or more elements united chemically in definite proportions by mass . For example, pure water is composed of the elements hydrogen (H) and oxygen (O) at the defined ratio of 11 % hydrogen and 89 % oxygen by mass . The observation that the elemental composition of a pure compound is always the same is known as the law of constant composition (or the law of definite proportions ). It is credited to the French chemist Joseph Louis Proust...
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- Fall '10