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Science · Grades 3–4

Molecule

noun

The smallest particle of a substance that retains the chemical properties of that substance.

Example Sentences

"A water molecule is made of two hydrogen atoms and one oxygen atom."

"Molecules are made up of two or more atoms bonded together."

Synonyms & Related Terms

compound particle

Quick Check

Which best describes the meaning of molecule?

Study Tips

To remember molecule, try writing it in a sentence of your own. Connect it to something you already know about science.

Use it in conversation today — saying a word aloud three times helps lock it into long-term memory.