Which of the following isoelectronic ion has the lowest ionization energy?

CHEMISTRY · Single correct · A Level · Chemistry · Periodicity and periodic trends · Periodicity and periodic trends

Problem

Which of the following isoelectronic ion has the lowest ionization energy? (1)

\text{K}^+

(2)

\text{Cl}^-

(3)

\text{Ca}^{2+}

(4)

\text{S}^{2-}