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• n  an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)

• deuterium

News & Articles

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• Hark, Quarks! Strange Tiny Particles Loom Large in New Study
  The most precise measurement yet of a fundamental property of quarks — one of the building blocks of matter — brings scientists closer to finding new exotic particles. At the U.S. Department of Energy's Thomas Jefferson National Accelerator Laboratory, scientists fired a beam of electrons at an atom of deuterium, or heavy hydrogen, which consists of one proton and one neutron. They looked at the ...
  Feb. 10, 2014 - LiveScience.com via Yahoo! News