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zeptogram or zeptogramme is equal to 10-21 gram (unit of mass), comes from a combination of the metric prefix zepto (z) with the gram (g). Plural name is zeptograms.
attogram or attogramme is equal to 10-18 gram (unit of mass), comes from a combination of the metric prefix atto (a) with the gram (g). Plural name is attograms.