What kind of element combines in covalent bond?

Answer 1

Almost any element, including most of the noble gases, can form covalent bonds, but non-metallic elements other than the noble gases form the most.

Answer 2

Nonmetals and metalloids typically combine in covalent bonds. Covalent bonds involve the sharing of electron pairs between atoms to achieve a stable electron configuration. This sharing allows both atoms to attain a full outer shell of electrons and form a stable molecule.