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 number and arrangement of electrons in an atom define the chemical characteristics of elements. One way to think of electrons is that they are the part of the atom that shows. They are the outer coating. They are the glue that holds atoms together in chemical bonds. The basic electron number is determined by the number of protons. In a stable carbon-12 atom there are six electrons, since there are six protons.