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2017 Word of the Year

formula unit

noun, Chemistry.
1.
(of an ionic compound that does not form molecules, as most salts) the chemical formula with the least number of elements out of the set of empirical formulas having the same proportion of ions as elements:
NaCl is the formula unit for the ionic compound sodium chloride.
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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