Question

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

(a) Mg < Ca < Cl < P 

(b) Cl < P < Mg < Ca

(c) P < Cl < Ca < Mg 

(d) Ca < Mg < P < Cl

Answer 1

The correct option is : (b) Cl < P < Mg < Ca

Explanation:

The atomic radii decrease on moving from left to right in a period, thus order of sizes for Cl, P and Mg is Cl < P < Mg. Down the group size increases. Thus overall order is : Cl < P < Mg < Ca.