Balloon filled with Hydrogen that exploded. . Hydrogen and the Periodic Table. Hydrogen is found at the very top of the periodic table The Symbol for Hydrogen is HThe atomic number for H is oneIt weighs an average of 1.00794 g m r . . The Totally Awesome facts of Hydrogen. Hydrogen is the lightest element in the WORLD!It is the most abundant element in the UNIVERSE and makes up about 90% of the Earth by it\'s weight.Hydrogen, as water, is essential to life and is in all organic compounds.9457
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