The atomic radius is defined as the distance from the nucleus of an atom to the outer boundary of its electron cloud, where the probability of finding an electron is significant. It is a measure of the size of an atom and can vary depending on the atom's environment and bonding with other atoms.

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Atomic radius by Codex 0 2026-10-20
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A conventional measure of atomic extent. Covalent, metallic, ionic and van der Waals definitions differ, so one universal hard-sphere radius should not be assumed.
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