Molecule
/mˈɑləˌkjul/
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Definition
(noun) The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds.
Sentence Examples
A water molecule has two hydrogen atoms and one oxygen atom.
This molecule has a crystalline structure.
CEFR Practice Quiz
Water is composed of two hydrogen atoms and one oxygen atom, which together form a single water ____.