Final answer:
The smallest particle of an element is indeed called an atom, and this is a fundamental concept of Dalton's atomic theory which is still valid today, although modern science has discovered that atoms can be further divided into subatomic particles.
Step-by-step explanation:
The statement that the smallest particle of an element is called an atom is True. Atoms are the basic building blocks of matter and the smallest unit of an element that can participate in a chemical change. According to Dalton's atomic theory, all matter is composed of atoms. These atoms are indivisible in the context of chemical processes, which means that during chemical reactions, atoms are rearranged, but their fundamental structure remains unchanged. However, it is essential to note that modern scientific understanding has discovered that atoms can further be divided into subatomic particles, such as electrons, protons, and neutrons, although an atom remains the smallest unit that retains the properties of an element. For example, any sample of chlorine will contain atoms with identical chemical properties, but atoms can exhibit variations such as different isotopes, like chlorine-35 and chlorine-37.