Which term describes the simplest form of chemical matter?

• A. A Compound
• B. An Element
• C. A Molecule
• D. A Mixture

Answer: (B)

Elements are the simplest form of chemical matter. An element is a pure substance made of only one kind of atom and cannot be broken down into simpler substances by chemical means. Molecules can be built from atoms of the same element (like O2) or from different elements, but a molecule of an element remains the same element. When elements combine in fixed ratios, they form compounds, which are more complex. A mixture is just a physical blend of substances not chemically bonded. So the pure, simplest form of matter is an element.