Category:Hydrogen
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| + | [[File:Hydrogen 2005 Liquid Hydrogen Bubble Chamber.jpg|200px|thumb|right|The first track of a liquid hydrogen bubble chamber - Photo by John Wood.]] | ||
| − | + | A chemical element with the symbol H and the atomic number of 6. It constitutes 75% of the known mass of the universe | |
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| + | [[Category:Elements|{{PAGENAME}}]] | ||
Latest revision as of 15:57, 13 February 2013
A chemical element with the symbol H and the atomic number of 6. It constitutes 75% of the known mass of the universe
