History
History
History
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Meaning:
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the smallest unit of a chemical element

smallest part of something

bit crumb dot fragment grain iota jot minimum mite modicum molecule morsel mote ounce particle scintilla scrap shred smidgen speck spot tittle trace whit
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Cases of word usage

1) a splitting or division, e.g. of an atom (fission)

ATOM as in Wiktionary
ATOM as in Wikipedia