For the element X, student Mohini measured its radius \( \mathrm{P} \) as \( 102 \mathrm{~nm} \)...

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For the element X, student Mohini measured its radius
\( \mathrm{P} \)
as \( 102 \mathrm{~nm} \), Nora as \( 113 \mathrm{~nm} \) and Khushi as \( 100 \mathrm{~nm} \)
W
using same apparatus. Her teacher ATS sir explained that measurements were correct by saying that recorded values by three students were
(1) Crystal, vander Waal and covalent radii
(2) Covalent, crystal and vander Waal radii
(3) Vander Waal, ionic and covalent radii
(4) None is correct
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