Q. Given two statements below :
Statement I : In molecule the covalent radius is double of the atomic radius of chlorine.
Statement II : Radius of anionic species is always greater than their parent atomic radius.
Choose the most appropriate answer from options given below :

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Solution:

In molecule, the covalent radius is half of the internuclear distance, so statement(I) is false.
For the same element, anion has lower effective nuclear charge than atom so anion is larger than atom. statement (II) is correct.