A compound that contains only two elements is called a binary compound. In naming the compounds containing two elements, a metal and a nonmetal, the first element is named as such and the name of the second element, i.e., the more electronegative element changes its ending to –ide. For example,
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NaCl is named as Sodium chloride
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Cao is named as Calcium oxide
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FeS is named as Iron sulphide
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BaCl2 is named as Barium Chloride