For the element X, student Anamika measured its radius as 102 nm, Animesh as 113 nm and Anirudh as 100 nm using same apparatus. Their teacher explained that measurements were correct by saying that recorded values by three students were :

A
crystal, van der Waals' and covalent radii
B
covalent, crystal and van der Waals' radii
C
van der Waals', ionic and covalent
D
none is correct

Solution:

Due to the fact that radii=Van Dar Waal> Metallic> Covalent.
As a result, he notes values of 102 nm for metallic (Crystal radii), 100 nm for covalent radii, and 203 nm for the Van der Waal equation.

For the element $X$ , student Anamika measured its radius as 102 nm, Animesh as 113 nm and Anirudh as 100 nm using same apparatus. Their teacher explained that measurements were correct by saying that recorded values by three students were :

Solution:

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