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Wikipedia definition
1. Atomic radiusThe atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the nucleus to the boundary of the surrounding cloud of electrons. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius.
Read “Atomic radius” on English Wikipedia
Read “原子半径” on Japanese Wikipedia
Read “Atomic radius” on DBpedia

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