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Deuterium: A non-radioactive isotope of hydrogen that contains a neutron in its nucleus in addition to the one proton normally seen in hydrogen. A deuterium atom is twice as heavy as normal hydrogen.
Deuterium (chemical symbol D or ²H) is a stable isotope of hydrogen, found in extremely small amounts in nature. The nucleus of deuterium, called a deuteron, contains one ...
Library > Literature & Language > Dictionary ( dū-tîr ' ē-əm, dyū- ) n. An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic ...
deuterium (chemical isotope), isotope of hydrogen with atomic weight of approximately 2. Its nucleus, consisting of one proton and one neutron, has double the mass of ...
noun Chemistry . an isotope of hydrogen, having twice the mass of ordinary hydrogen; heavy hydrogen. Symbol: D; atomic weight: 2.01; atomic number: 1. Origin: 1933 ...
Deuterium, also called heavy hydrogen, is one of two stable isotopes of hydrogen. with a natural abundance. in Earth's oceans of about one atom