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Element number one, is in the group other non-metals (alongside C, N, O, P, S, Se), has an atomic weight of 1.00974 amu, a hexagonal crystal structure, and a atomic radius of 53 picometers (pm). It is found the Sun, and was once used in blimps, before helium as used.
The people who inflate the blimps knew hydrogen (H) is reactive, so they went helium (He) for blimps, which is non-flammable.
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by MidnightStar18 February 01, 2019
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Hydrogen, with the symbol H, is the first element in the Periodic Table. Its atomic number is 1 and the relative atomic mass it has is 1.0079. It is a reactive nonmetal.
Hydrogen is not what you breathe, it's oxygen!
by Gervy February 01, 2019
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