Q. 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
Explanation
[Solution from source] Across period 3 radius decreases (Mg > P > Cl), and down group 2 it increases (Ca > Mg). So the increasing order is Cl < P < Mg < Ca. Orders starting with Ca or Mg reverse the periodic trend. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.