KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
Computer graphic of an atom of Helium. The nucleus of Helium contains two protons (red) and two neutrons (blue). An electron cloud surrounds the nucleus, which in Helium contains two electrons orbiting in a single energy level. The number of electrically positive protons balances the number of electrically negative electrons to make the atom neutral overall. Helium is one of the noble gases. It is used for arc welding; as a coolant in nuclear reactors; for pressurizing liquid fuelled rockets; and in gas lasers and for filling balloons. Gaseous Helium is lighter than superconductivity.
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