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.
1 Atom-smallest unit of all matter, that is composed of 3 sub-atomic particles called protons, electrons and neutrons. 2  Proton-the 'heavy' positively-charged particle in the nucleus of an atom. 3  Electron-the very 'light' negatively-charged particle that orbits the nucleus of an atom.lements and Compounds. 1  Element-An element is a substance composed of the same type of atoms (e.g. gold Au, oxygen O 2). 2  Compound-A compound is a substance made of more than one type of atom (e.g. water H 2 O, carbon dioxide CO 2).