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.
Definition List: atom - An atom is the smallest unit of an element that still has all the properties. of that substance. In most cases, an atom consists of protons, neutrons, and. electrons. The protons and neutrons are found in the center of the atom, called the.