10. 
    deuterium
    (D) (doo-tēr´e-әm) the mass 2 isotope of hydrogen; it is available as a gas or heavy water and has been used as a tracer or indicator in metabolic studies.
    Found op http://www.encyclo.co.uk/local/21001
    
    
11. 
    deuterium
    isotope of hydrogen with atomic weight of approximately 2. Its nucleus, consisting of one proton and one neutron, has double the mass of the nucleus ... [13 related articles]
    Found op http://www.britannica.com/eb/a-z/d/37
    
    
12. 
    Deuterium
    Deuterium/protium ratios thus continue to be an active topic of research in both astronomy and climatology. ==Differences between deuterium and common hydrogen (protium)== ===Chemical symbol=== Deuterium is frequently represented by the chemical symbol D. Since it is an isotope of hydrogen with mas...
    Found op http://en.wikipedia.org/wiki/Deuterium
    
    
13. 
    Deuterium
    Isotope of hydrogen, with a nucleus containing one proton and one neutron, and an atomic mass number of 2.
    Found op http://www.physicalgeography.net/physgeoglos/d.html
    
    
14. 
    Deuterium
    'Heavy Hydrogen', an isotope having one proton and one neutron in the nucleus. It occurs in nature as 1 atom to 6,500 atoms of normal hydrogen, (Hydrogen atoms contain one proton and no neutrons).
    Found op http://www.encyclo.co.uk/local/21076
    
    
15. 
    deuterium
    A heavy isotope of hydrogen in which the nucleus contains one proton and one neutron (compared with ordinary hydrogen`s single proton). Deuterium was discovered and named (from the Greek deuteros meaning 'second') by Harold Urey in 1933. In chemical equations it is denoted by the letter 'D'...
    Found op http://www.daviddarling.info/encyclopedia/D/deuterium.html
    
    
16. 
    deuterium
    deuterium (dOOtēr'ēum) , isotope of hydrogen with mass no. 2. The deuterium nucleus, called a deuteron, contains one proton and one neutron. Deuterium is also called heavy hydrogen, and water in which the hydrogen atoms are deuterium is called heavy water (deuterium oxide, D2O). Deut...
    Found op http://www.infoplease.com/ce6/sci/A0815319.html
    
    
17. 
    Deuterium
    In chemistry, deuterium is an isotope of hydrogen having twice the mass of ordinary hydrogen.
    Found op http://www.probertencyclopaedia.com/browse/GD.HTM
    
    
18. 
    deuterium
    (D) Type: Term Pronunciation: dū-tē′rē-ŭm Synonyms: hydrogen-2
    Found op http://www.medilexicon.com/medicaldictionary.php?t=24155
    
    
19. 
    deuterium
    Naturally occurring heavy isotope of hydrogen, mass number 2 (one proton and one neutron), discovered by US chemist Harold Urey in 1932. It is sometimes given the symbol D. In nature, about one in every 6,500 hydrogen atoms is deuterium. Combined with oxygen, it produces `heavy water` (D₂...
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0009971.html
    
    
20. 
    Deuterium
    An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen;deuterion atoms contain both a proton and a neutron in the nucleus.
    Found op http://www.chemistry-dictionary.com/definition/deuterium.php
    
    
21. 
    Deuterium
    a non-radioactive isotope of the hydrogen atom 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. See also tritium.
    Found op http://www.bt.cdc.gov/radiation/glossary.asp
    
    
22. 
    deuterium
    1) Heavy hydrogen 2) Hydrogen atom 3) Isotope 4) Reactor isotope
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/deuterium/1
    
    

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