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.
Atomic Structure. The space every atom occupies is divided into two structural components: the nucleus and orbitals. The nucleus is the center of the atom, and orbitals surround the nucleus. Orbitals are different shapes depending on their energy; these shapes are calculated using quantum mechanics. A sphere is the most basic orbital shape; others include rings and teardrops.