chemical formulas
symbolic representations that specify the elements present in a compound and the relative numbers of atoms of each element present
molecular compounds
compounds composed of distinct units called compounds
ionic compound
any compound composed of a vast array of ions
molecular formula
formula that tells how many of each type of atom are found in a molecule of a substance
empirical formulas
formula that shows only the simplest ratio of atoms in a compound
formula unit
simplest ratio of atoms in an ionic compound
binary compounds
contains atoms of only two elements
unchanged
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the first element of a binary compound is _____________
-ide
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the second element in a binary compound is changed to end in -______
nonmetals
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this system is used primarily for molecular compounds containing two ____________