Isoelectronic species have the same number of electrons. This property is not only restricted to atoms but also observed in molecules and ions.
Which of the following statements is correct for the following isoelectronic series?
`S^(2-), Cl^(-), K^(+), Ca^(2+)` 

Options

A. The size of the ions initially increases then decreases.
B. The first ionization energy decreases from left to right.
C. The first ionization energy increases from left to right.
D. None of these.

Answer

C