Atomic #Cl# should be smaller than atomic #Na#, given their position on Period 3. On moving down the group, the atomic radius increases. A Na < K < Mg < Rb B K < Na < Mg < Rb C Mg < Na < K < Rb D Rb < K < Mg < Na Medium Solution Verified by Toppr Correct option is C) The increasing order of atomic radius is Mgthus across the Period atomic size decreases. Well, atomic size depends on electronic radius, and INCOMPLETE electronic shells shield the nuclear charge very ineffectively. We know that (i) atomic radius decreases ACROSS a Period from left to right as we face the Table and (ii) atomic radius INCREASES down a Group, a column of the Periodic Table. And the only reasonable definition is by ATOMIC or IONIC RADIUS.
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