Which statement defines compounds?

Which statement defines compounds?

• A. They are mixtures of elements with no bonds.
• B. They are molecules comprised of two or more different elements bonded together.
• C. They are single elements with two atoms.
• D. They are elements bonded by ionic bonds.

Answer: (B)

Compounds form when two or more different elements bond together, creating a single substance with properties distinct from its elements. The option that describes a compound as a molecule made of two or more different elements bonded together best captures this idea, since bonding between elements in a fixed ratio is what defines a compound. For context, think of water: hydrogen and oxygen join by chemical bonds to make a new substance. Some compounds are ionic in nature (like table salt) and form lattice structures rather than discrete molecules, but the core idea remains that new substances arise from bonds between different elements. The other statements aren’t correct for defining compounds: mixtures are just physical blends with no bonds between components; a diatomic description refers to two atoms of a single element (or two atoms in a simple molecule, which isn’t necessarily a compound of two elements); and limiting to ionic bonds excludes many covalent compounds.

Compounds form when two or more different elements bond together, creating a single substance with properties distinct from its elements. The option that describes a compound as a molecule made of two or more different elements bonded together best captures this idea, since bonding between elements in a fixed ratio is what defines a compound.

For context, think of water: hydrogen and oxygen join by chemical bonds to make a new substance. Some compounds are ionic in nature (like table salt) and form lattice structures rather than discrete molecules, but the core idea remains that new substances arise from bonds between different elements.

The other statements aren’t correct for defining compounds: mixtures are just physical blends with no bonds between components; a diatomic description refers to two atoms of a single element (or two atoms in a simple molecule, which isn’t necessarily a compound of two elements); and limiting to ionic bonds excludes many covalent compounds.