GENERAL KNOWLEDGE

Detailed explanation-1: -Covalent or molecular compounds form when elements share electrons in a covalent bond to form molecules. Molecular compounds are electrically neutral. Ionic compounds are (usually) formed when a metal reacts with a nonmetal (or a polyatomic ion). Covalent compounds are formed when two nonmetals react with each other.

Detailed explanation-2: -Hydrogen can combine with all the non-metals to form covalent compounds as atomic hydrogen is highly reactive.

Detailed explanation-3: -Molecules that have covalent linkages include the inorganic substances hydrogen, nitrogen, chlorine, water, and ammonia (H2, N2, Cl2, H2O, NH3) together with all organic compounds.

Detailed explanation-4: -Covalent bonds form primarily between nonmetal elements, although these types of bonds can occur between metals and nonmetals.

Detailed explanation-5: -In general, covalent bonds form between nonmetals, ionic bonds form between metals and nonmetals, and metallic bonds form between metals.