Which kind of element forms covalent bonds give two reasons for this

Covalent bonds form when electrons are shared between two nonmetals. A covalent bond involves a pair of electrons being shared between atoms.

Atoms form covalent bonds in order to reach a more stable state.

A given nonmetal atom can form a single, double, or triple bond with another nonmetal. Which type of bond is formed between the atoms depends on their numbers of valence electrons.