Ionic radii of some common ions range from C |
  at lower left to S  at upper right. Ions are arranged in vertical
groups based on charge, from
at left to at right. Note
that the anions tend to have larger ionic radii than cations. Ions in each
of the pairs Si and
Al ,
Mg, and
Fe, and
Na and
Ca are about the same size and
commonly substitute for each other in crystal lattices. Radii are
expressed in nanometers (nm).
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