How does the nuclear charge affect ion size?
Consider the following collection of ions: ion electrons protons O2- 10 8 F- 10 9 Na+ 10 11 Mg2+ 10 12 Al3+ 10 13 Each ion: • contains the same number of electrons (10; with configuration 1s22s22p6) and are thus termed a collection of isoelectronic ions • varies in the nuclear charge The radius of each ion decreases with an increase in nuclear charge: Oxygen and fluorine precede neon and are nonmetals, sodium, magnesium and aluminum come after neon and are metals.
