Question

why compounds formed by combination of highly reactive non metals with highly reative metals are generally ionic in nature while compounds formed between non metal themselves ae covalent in character

Answer 1

Highly reactive metals are so because they are capable of quickly donate their electrons and attain octet state of stability, similarly reactive non metal are electron acceptors. Hence formation of ions ans then ionic compounds in easier for them.

However for other elements their valencies are such that loosing and gaining of electrons are energetically not favourable and hence they share their electrons and thus form covalent compounds.