(A) : Mg^(2+) and Al^(3+) are isolectronic but the magnitude of ionic radius of Al^(3+) is less than that in Mg^(2+). (R ) : The effective nuclear charge on the outermost electrons in Al^(3+) is greater than that in Mg^(2+).

(A) : Mg^(2+) and Al^(3+) are isolectronic but the magnitude of ionic

1.	(A) : Mg^(2+) and Al^(3+) are isolectronic but the magnitude of ionic radius of Al^(3+) is less than that in Mg^(2+). (R ) : The effective nuclear charge on the outermost electrons in Al^(3+) is greater than that in Mg^(2+).
Answer» Both Aand R are CORRECT. R is the correct EXPLANATION of A. Both A and R are correct, R is not the correct explanation of A. A is TRUE and R is false A is false , but R true Answer :A