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Define 

(i)  Atomic radius 

(ii)  Covalent radius

(iii)   Metallic radius

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(i)  Atomic radius: The distance from the centre the nucleus to the outermost shell of an atom. 

(ii) Covalent radius: One half of the distance between the nuclei of two covalently bonded atoms.

(iii) Metallic radius: Half the inter nuclear distance separating the metal cores in the metallic crystal

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