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atom British & World English

The smallest particle of a chemical element that can exist

atom English Thesaurus

they build tiny circuits atom by atom

the atom in atom British & World English

Atomic particles as a source of nuclear energy

atom bomb British & World English

A bomb which derives its destructive power from the rapid release of nuclear energy by fission of heavy atomic nuclei, causing damage through heat, blast, and radioactivity

hollow atom British & World English

An atom in which inner-shell electrons are missing, usually as a result of electrical excitation

atom smasher British & World English

Informal term for particle accelerator.

Rydberg atom British & World English

An atom in a highly excited state in which one electron has almost sufficient energy to escape. Atoms, usually hydrogen atoms, in this Rydberg state are used in atomic research