Encyclopediaatomatom [Gr.,=uncuttable (indivisible)], basic unit of matter; more properly, the smallest unit of a chemical element having the properties of that element. Sections in this article: The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on atom from Fact Monster:
- atomism - atomism atomism, philosophic concept of the nature of the universe, holding that the universe is ...
- electron - electron electron, elementary particlecarrying a unit charge of negative electricity. Ordinary ...
- proton - proton proton, elementary particle having a single positive electrical charge and constituting the ...
- neutron - neutron neutron, uncharged elementary particle of slightly greater mass than the proton. It was ...
- exclusion principle - exclusion principle exclusion principle, physical principle enunciated by Wolfgang Pauli in 1925 ...
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