alleryThe covalent radius of a hydrogen atom, given that the distance between the two nuclei in an H2 molecule is 0.74 angstrom, is:
A0.37 angstrom
B0.74 angstrom
C1.11 angstrom
D1.48 angstrom
Answer & Solution
Correct answer: A. 0.37 angstrom
1. Covalent radius is half the distance between the nuclei of two bonded atoms of the same element.
2. Internuclear distance in H2 is 0.74 angstrom.
3. Covalent radius $= \dfrac{0.74}{2} = 0.37$ angstrom.
Taking the full internuclear distance gives 0.74, but the radius is only half of it.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 8 Periodic Classification of Elements "Atomic Radius", p.116_
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