Building 3D models is a common activity in science class. The 3D models give kids a better understanding of how various scientific elements work and look. A 3D atom model is simple to make and requires only a few supplies. The main components of atoms are protons, neutrons and electrons. The nucleus is made up of the protons and neutrons. Color-coding the components of the atoms in the model helps easily identify them for a better understanding of the atom's construction.