Question

Half the internuclear distance between two atoms bonded by a single covalent bond.
If true enter 1, else enter 0

Answer 1

Covalent radius is half of the internuclear separation between the nuclei of two single-bonded atoms of the same species (homonuclear).

While van der Waals radius is used to define half of the distance between the closest approach of two non-bonded atoms of a given element.