Question

Element P belongs to first group and fourth period of the periodic table. Element Q succeeds P in the . group and element R succeeds Q in the period. The correct increasing order of their atomic radii is

(A) Q<R<P

(B) P<Q<R

(c) P<R<Q

(D) Cannot be predicted.

Answer 1

Correct option  (c) P<R<Q

Explanation: 

P and Q belong to same group and Q succeeds P i.e., Q is bigger in size than P. Now, Q and R belong to same period and R succeeds Q. Therefore, R will be smaller in size than Q but will be bigger in size than P.