NEET 2010 Chemistry question

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

(1)Mg < Ca < Cl < P
(2)Cl < P < Mg < CaCorrect
(3)P < Cl < Ca < Mg
(4)Ca < Mg < P < Cl

Answer: (2)

Solution

Mg, P and Cl lie in the third period. Across a period atomic radius decreases (nuclear charge increases with the same number of shells), so Cl < P < Mg. Ca lies in the fourth period, directly below Mg

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Question ID VK-090365