Classification Of Elements And Periodicity In Properties Question 5
Question 5 - 31 January - Shift 1
The correct increasing order of the ionic radii is
(1) $Cl^{-}<Ca^{2+}<K^{+}<S^{2-}$
(2) $K^{+}<S^{2-}<Ca^{2+}<Cl^{-}$
(3) $S^{2-}<Cl^{-}<Ca^{2+}<K^{+}$
(4) $Ca^{2+}<K^{+}<Cl^{-}<S^{2-}$
Show Answer
Answer: (4)
Solution:
Formula: Ionic radius
In isoelectronic species size $\propto \frac{1}{Z}$
$ Ca^{2+}<K^{+}<Cl^{-}<S^{2-}: \text{ Size } $
