EVERYDAY SCIENCE

Detailed explanation-1: -In general, covalent bonds form between nonmetals, ionic bonds form between metals and nonmetals, and metallic bonds form between metals.

Detailed explanation-2: -In general, the elements that combine to form binary molecular compounds are both nonmetals. This contrasts with ionic compounds, which involve bonds between metal cations and nonmetal anions.

Detailed explanation-3: -Covalent bonds form when two or more nonmetals combine. For example, both hydrogen and oxygen are nonmetals, and when they combine to make water, they do so by forming covalent bonds.

Detailed explanation-4: -Two different metals can technically have metallic bonds, but that would become an alloy, which is not a compound but a mixture, since you can change its composition. Whereas the metallic bonds between two atoms of the same metal form a compound.