Hydrogen Element

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Hydrogen is the chemical element with the symbol H and atomic number  1. With a standard atomic weight of 1.008 , hydrogen is the lightest element in the periodic table . Hydrogen is the most abundant chemical substance in the Universe , constituting roughly 75% of all baryonic mass. [7] [note 1] Non- remnant stars are mainly composed of hydrogen in the plasma state . The most common isotope of hydrogen, termed protium (name rarely used, symbol 1 H), has one proton and no neutrons .