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Glossary term: Atom

Description: Democritus, an Ancient Greek philosopher, thought that the atom is an indivisible part of matter. We now know that the atom is made up of electrons, protons, and neutrons, and some of these particles are made up of even smaller parts. Hence the word atom is generally used to describe the fundamental unit of which everything we know is made; its diverse forms are organized and classified in the periodic table. These chemical elements are observed in various parts of the known Universe.

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Term and definition status: This term and its definition is still awaiting approval

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".