With increase in the number of electrons in the same shell, the atomic radii decreases due to increase in effective nuclear charge. However, atomic radii increases, as the number of shells increases. Thus, on moving down a group atomic radii increases. The electronic configuration of the given elements is Mg12Ca20=[Ne]3 s2=[Ar]4 s2 P15=[Ne]3 s23p3Cl17=[Ne]3 s23p5 In Mg,P and Cl, the number of electrons are increasing in the same shell, thus the order of their atomic radii is Cl<P<Mg In Ca, the electron is entering in higher shell, thus, it has the highest atomic radii among the given. Thus, the order of radii is Cl<P<Mg<Ca
Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is
NEET UG 2010 — Chemistry Inorganic Chemistry
2010mcqeasy
Among the elements Ca,Mg,P and Cl, the order of increasing atomic radii is
Official previous-year question
Held on 30 Apr 2010 · Verified 9 Jul 2026.
Options
- A
Mg<Ca<Cl<P
- B
Cl<P<Mg<Ca
- C
P<Cl<Ca<Mg
- D
Ca<Mg<P<Cl
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