Answer
See the explanation
Work Step by Step
The matching of the ions to the relative size representations is as follows:
$Sc^{3+}$ - Smallest ion
$K^+$
$Ca^{2+}$
$Cl^-$
$S^{2-}$ - Largest ion
The size of the ions is primarily determined by the number of protons and electrons in the ion. As the nuclear charge increases, the effective nuclear charge experienced by the electrons also increases, causing the ions to become smaller. Conversely, as the number of electrons increases, the ion becomes larger.
The order of the ions from smallest to largest is:
$Sc^{3+}$ < $Ca^{2+}$ < $K^+$ < $Cl^-$< $S^{2-}$
