Which element has the smallest ionic radius?
A. Cl-
B. K+
C. Ca2+
D. Sc3+
Answer:D
Which element has the smallest ionic radius?
A. Cl- B. K+ C. Ca2+ D. Sc3+
Explanation: Sc3+ has the smallest ionic radius in this group of ions because when going from left to right across a period, ionic radius generally decreases due to increased effective nuclear charge, and Sc3+ is the last ion in the period.