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.
An atom is the smallest unit of an element. There are 3 parts of an atom: 1  proton-positive electrical charge, found in the nucleus of an atom. 2  neutron-neutral or no electrical charge, found in the nucleus of an atom. 3  electron-negative electrical charge, found circling the nucleus.