atom · noun C /ˈæt.əm/
atom
B2 the smallest unit that an element can be divided into
Dictionary example:
A molecule of carbon dioxide (CO2) has one carbon atom and two oxygen atoms.
Learner example:
Anyway, the manager of that cent[er] called me in order to inform me that I would [be doing] research on nuclear power and atoms. (First Certificate in English; B2; Greek)
