Hydrogen: Wikipedia summary by WikiSummarizer
Monday, October 24th, 2011
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Wikipedia article: Hydrogen
Hydrogen
Hydrogen (100)
· It is represented by the symbol H. With an average atomic weight of 1.00794 u (1.007825 u for Hydrogen-1), hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass.
· Stars in the main sequence are mainly composed of hydrogen in its plasma state.
· Naturally occurring elemental hydrogen is relatively rare on Earth.
· The most common isotope of hydrogen is protium (name rarely used, symbol H) with a single proton and no neutrons.
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