The radius of the Cl ion is 38% larger than that of the F ion but the radius of the Br ion is onl — AITS & Test Series Chemistry Question

Question

The radius of the Cl ion is 38% larger than that of the F ion but the radius of the Br ion is only 6.5% larger than that of the Cl ion. The relatively small difference in size between Cl and Br ion is due to the fact that (A) The Br ion contains ten 3d electrons, which fails to shield the nuclear charge effectively. (B) The Br ion contains ten 3d electrons, which shield the nuclear charge effectively. (C) The Br ion contains six 4p electrons which shield the nuclear charge effectively. (D) The Br ion contains ten 3d electrons and six 3p electrons, together they shield the nuclear charge effectively.