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Tin is a chemical element with the symbol Sn (for Latin: stannum) and atomic number 50. It is a main group metal in group 14 of the periodic table. Tin shows a chemical similarity to both neighboring group-14 elements, germanium and lead, and has two possible oxidation states, +2 and the slightly more stable +4.
Carbon is an element. The copper in a penny is an. example of another element. In a pure copper sample, all the atoms have. the same identity. Altogether, there are 111 recognized elements. An atom. is the base unit, or simplest form of an element. ! 146! Compounds Materials called compounds are made. from atoms of two or more elements that are combined chemically. The. ratio of the different atoms in a compound is always the same. For. example, the elements hydrogen and oxygen can combine to form the. compound water.