Structure facts

Stylised atom with three Bohr model orbits and stylised nucleus
Schematic atomic structure

Structure is a fundamental concept in science. It means the arrangement of parts. Examples are the organs in a body, or crystals in a substance like granite.

A structure may refer to buildings, machines and similar things made by people as well as to a rock or a mineral, atoms or sentences. It always reflects the hierarchy of its parts.

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Structure Facts for Kids. Kiddle Encyclopedia.