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Van der waals radius

In chemistry, a van der Waals radius is a measure for the size of an atom that is not chemically (ionically or covalently) bound. In general a van der Waals radius is defined as half the closest distance of two equal, non-covalently bound, atoms.

Pronunciation
/van diːə vɑːlz ˈreɪdɪəs/
/væn dər vɑlz ˈreɪdiəs/