Recall that ionic radius is the size of an ion. The trend for the 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.
Recall that the atomic number of an element gives us the number of electrons of the neutral element.
Arrange the following ions, Sc3+, Cl1-, K1+, S2- in order of increasing ionic size.
a. Sc3+ < K1+ < S2- < Cl1-
b. K1+ < Sc3+ < Cl1- < S2-
c. Sc3+ < K1+ Cl -1 < S2-
d. K1+ < Sc3+ < S2- < Cl1-
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