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Hydrogen is the chemical element with atomic number 1. It is represented by the symbolH. 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.
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Hydrogen
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