One half of the distance between 2 covalently bonded atoms in a diatomic molecules is called
Atomic radius
Metallic radius
Vander walls radius
Covalent radius
As we have learned
Covalent Radius -
It is one half of the distance between the nuclei of the two covalently bonded like atoms in a homo diatomic molecule is called the covalent radius of that atom.
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Thus, the covalent radius is half of the distance between two covalently bonded atoms in a diatomic molecule.
Therefore, Option(4) is correct