A substance made up of atoms of two or more different elements joined by chemical bonds is called what?

• A. Element
• B. Compound
• C. Mixture
• D. Pure substance

Answer: (B)

Two or more elements joined by chemical bonds form a compound. When elements combine chemically, they create a new substance with a definite ratio and properties different from the individual elements. This bonding locks the elements into a single substance, so you can’t separate them by ordinary physical means. An element, by contrast, contains only one type of atom. A mixture is a physical combo of substances that aren’t bonded, so each part often keeps its own properties and can usually be separated. A pure substance has a fixed composition, but it can be either an element or a compound; the clue here—atoms from different elements bonded together—points to a compound.