RICHARD KAIL / SCIENCE PHOTO LIBRARY RICHARD KAIL / SCIENCE PHOTO LIBRARY
Hydrogen atom, conceptual model. Computer artwork representing the atomic structure of hydrogen. Hydrogen has one proton and one neutron (large spheres) in its nucleus (faint circle, centre), with one electron (bright dot) orbiting it. Each proton and neutron contains 3 quarks (smaller spheres): a neutron has one up quark and two down quarks, whereas a proton has two up quarks and one down quark.
Model release not required. Property release not available.