What is the smallest particle of an element called?

The smallest particle of an element is called an atom. Atoms are the fundamental building blocks of matter and represent the simplest form of an element that retains all of its chemical properties. Each element is defined by its unique type of atom; for example, all carbon atoms are identical and have specific characteristics that differentiate them from atoms of other elements.

Atoms consist of a nucleus, which contains protons and neutrons, and electrons that orbit around the nucleus. While the nucleus is an important part of an atom, it is not the smallest particle on its own because it is made up of protons and neutrons. Molecules are formed when two or more atoms bond together, representing a combination of atoms rather than a single element. Ions are atoms or molecules that have gained or lost one or more electrons and carry an electrical charge, but they are still considered derived from atoms.

In summary, an atom is the smallest unit of an element that maintains its chemical identity, making it the correct answer to the question.