Which of the following isoelectronic ions has the lowest ionization energy?
Which of the following isoelectronic ions has the lowest ionization energy?
A. `K^+`
B. `Ca^(2+)`
C. `Cl^-`
D. `S^(2-)`
4 views
1 Answers
Correct Answer - D
Nuclear charge on `K^(+),Ca^(2+),Cl^(-) and S^(2-)` are 19,20,17 and 16 respectively. Lesser the nuclear charge, lesser is the ionisation energy.Thus ionisation energy of `S^(2-)` is least.
4 views
Answered