CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Atomic structure. Computer artwork showing the components of matter. From left to right: Every element (far left) is made up of atoms (purple spheres) that are comprised of a central nucleus (red) orbited by electrons (purple). The nucleus of each atom contains protons (orange) and neutrons (yellow), the number of which depends on the element. Each proton and neutron consists of three quarks (green). Protons have 2 'up quarks' and one 'down quark', and neutrons 1 'up quark' and 2 'down quarks'.
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