Question

3 students Ram, Shyam and Raj measured the radius of an element A using same apparatus. The values of their practical were not same (Ram 110 nm; Shyam 111 nm and Raj-108 nm). Their teacher explained that their measurement were correct by saying that the recorded values are (a) crystal, van der Waal and covalent radii respectively (b) covalent, crystal and van der Was! radii respectively (c) van der Waal, ionic and covlent radii respectively (d) none of the above

Answer 1

Answer:

option no. D

Explanation:

none off the above beacuse it s answer

Answer 2

Answer:

(a) is the correct option.

Explanation:

Covalent radii: It is the half of intermolecular distance between two covalently bonded atoms.

Crystal radii: It is the radius of a monatomic ion in an ionic crystal structure.

Van der Waal radius: of an atom is the radius of an imaginary hard sphere representing the distance of closest approach for another atom.

From the diagram we can see that:

Covalent radius > Ionic radius > Van der Waal radius

Therefore, measurements are of:

Crystal radius (Ram 110 nm); Van der Waal radius (Shyam 111nm) and Covalent radius (Raj-108nm).

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