Atomic radius

any measure of the size of atoms

measure of the size of an atom that forms part of one covalent bond

in chemistry, a measure for the size of an atom that is not chemically (ionically or covalently) bound; half the closest distance of two equal, non-covalently bound, atoms

physical constant; the most probable distance between an electron and the nucleus in a nonrelativistic model of the hydrogen atom with infinitely heavy nucleus

radius of an atom's ion in ionic crystals structure

decrease of ionic radii across the lanthanide series

rules to predict ionic compounds' crystal structures

ratio of electric charge to radius of an ion

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the ratio of the ionic radius of the cation to the ionic radius of the anion in a cation-anion compound

term used in chemistry to describe the effect of having full d orbitals on the period 4 elements