Select correct statement about radius of an atom :

  1. A

    Values of van der Waals' radii are larger than those of covalent radii because the van der Waals' forces are much weaker than the forces operating between atoms in a covalently bonded molecule.

  2. B

    The metallic radii are smaller than the van der Waals' radii, since the bonding forces in the metallic crystal lattice are much stronger than the van der Waals' forces.

  3. C

    Both are correct.

  4. D

    None is correct.

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    Solution:

    The internuclear distance is the distance crossing the path between the nuclei of the two linked atoms. The radius of an atom is equal to one-half of this internuclear distance. The van der Waal radius is the radius of the atom in which van der Waal forces exist.

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