Meaning of ATOM in English

ATOM

The smallest particle of an element that cannot be divided or broken up by chemical means. It consists of a central core of protons and neutrons, called the nucleus. Electrons revolve in orbits in the region surrounding the nucleus.

NRC Nuclear Energy English Glossary.      Английский глоссарий ядерной энергии NRC (Национальный научно исследовательский совет).