Question

b) Which has the largest atomic radius K(19) or Ca(20)?​

Answer 1

Answer:

K 19

Explanation:

because if less number of electrons present in the outer most shell less will be the attraction.and vice varsa..

Answer 2

POTASSIUM,

Potassium (K) with an atomic number of 19 has the largest atomic radius. This is because sodium and potassium are elements of group 1. ... The size of the atomic radius decreases on moving from left to right in a period of the periodic table .