Define covalent radius and metallic radius.

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(A) $1$. $Covalent \ radius$: It is defined as one-half of the distance between the nuclei of two identical atoms bonded by a single covalent bond in

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Covalent radius is the distance between the nuclei of two bonded atoms in a molecule,while metallic radius is half the distance between the nuclei of two adjacent metal atoms in a metallic lattice.

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(A) $1$. $Covalent \ radius$: It is defined as one-half of the distance between the nuclei of two identical atoms bonded by a single covalent bond in a molecule. For example,in $Cl_2$ molecule,the distance between two $Cl$ nuclei is $198 \ pm$,so the covalent radius is $99 \ pm$.$2$. $Metallic \ radius$: It is defined as one-half of the internuclear distance between two adjacent metal atoms in a metallic crystal lattice. For example,the distance between two adjacent $Cu$ atoms in a metallic crystal is $256 \ pm$,so the metallic radius is $128 \ pm$.

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