Which of the following sequences represents the correct decreasing order of ionic radii for the give — Periodic Table and Periodicity Chemistry Question
Question
Which of the following sequences represents the correct decreasing order of ionic radii for the given species: $S^{2-}, Cl^-, K^+, Ca^{2+}$?
Answer: A
💡 Solution & Explanation
All four species are isoelectronic with 18 electrons. Size decreases as the number of protons ($Z$) increases: S(16) > Cl(17) > K(19) > Ca(20).
💬Ask on WhatsApp →
Still have doubts about this question?
Send it to our AI chemistry tutor on WhatsApp — gets answered in minutes