50.4 MB (2.5 MB compressed)
3886 x 4534 pixels
33.0 x 38.4 cm ⏐ 13.0 x 15.1 in (300dpi)
RICHARD KAIL / SCIENCE PHOTO LIBRARY RICHARD KAIL / SCIENCE PHOTO LIBRARY
Helium atom, conceptual model. Computer artwork representing the atomic structure of helium. Helium has two protons and two neutrons (large spheres) in its nucleus (faint circle, centre), with two electrons (bright dots) 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.