What is the smallest unit of an element that retains the chemical properties of that element?

• A. Molecule
• B. Atom
• C. Element
• D. Compound

Answer: (B)

The chemical behavior of an element is determined by its atoms and the arrangement of their electrons, especially the valence electrons. The smallest unit that preserves those properties is the atom because it carries the characteristic electron configuration that defines the element’s chemistry. A molecule is simply a group of atoms bonded together and can exist for many elements; it’s not the fundamental unit that defines the element itself. An element is a pure substance made of one type of atom, but the term refers to the substance as a whole, not the smallest unit. A compound combines different elements, so it doesn’t represent the properties of a single element.