Recall that ionic radius is the size of an ion. The trend for ionic radius is as follows: it increases from right to left and down a period in the periodic table. Ionic radius also increases with an increasing number of electrons.
Na+ or Mg2+: For an isoelectronic series, the ionic radius will just depend on the charge of the ion: the more positive the charge of an ion is, the smaller the ion is.
–3 > –2 > –1 > 0 > +1 > +2 > +3
Which element has the smallest ionic radius?
a. Na+ or Mg2+
b. Be2+ or O2-
c. F‾ or S2-
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