Which of the following species has the largest ionic radius?

A. S²⁻
B. K⁺
C. CI⁻
D. Ca²⁺

Correct Answer:

Option D = Ca²⁺

Ecplanation:

Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.