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From Biology-Online Dictionary | Biology-Online Dictionary
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noun, plural:atoms

(physics, chemistry)

(1) The smallest unit of matter indivisible by chemical means.

(2) The fundamental building block of a chemical element.

(3) The smallest possible unit of an element that still has all the chemical properties of that element.


An atom is consisting of a nucleus surrounded by one or more shells of electrons.

Word origin: from the Greek átomos, which means uncuttable, something that cannot be divided further.
Related forms: atomic (adjective).

Related terms: