Sleep Number King Size 2-3 inch Mattress Bed Foam Topper Pad 7000, i8, i9.
Quick Answer. The three parts of an atom are the protons, neutrons and electrons. Atoms make up the basic building blocks of matter and define the structure of elements. These parts were not officially identified until 1932.
Chapter 2. Topic: Atoms, bonding. Main concepts: â¢Atoms are the smallest unit of an element. â¢Atoms bonded together make up molecules. â¢Atoms are composed of sub-atomic particles: protons (positive charge), electrons (negative charge), and. neutrons (no charge). Protons and neutrons have mass.