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[[Category:Chemistry]]
[[Category:Chemistry]]
Hydrogen has the atomic symbol H and the atomic number of 1. Hydrogen is the most abundant of all the chemical elements, the universe is composed of roughly 75% hydrogen. However naturally occuring elemental hydrogen on [[Earth]] is extremely rare.
Hydrogen has the atomic symbol H and the atomic number of 1. Hydrogen is the most abundant of all the chemical elements, the universe is composed of roughly 75% hydrogen. However naturally occuring elemental hydrogen on [[Earth]] is extremely rare.