Question

Name the isotope of an atom whose nucleus consists of proton only ..

Answer 1

Protons and neutrons are both nucleons, which may be bound together by the nuclear force to formatomic nuclei. The nucleus of the most common isotope of the hydrogenatom (with the chemical symbol "H") is a lone proton.

Answer 2

Protium. H is the most common hydrogen isotope with an abundance of more than 99.98%.