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.
The word atom comes from the Greek word 'atomos' which means  indivisible. This is misleading because atoms are not indivisible,  but can be broken down into at least three â¦ main subcomponents.