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  1. Vor einem Tag · To help compare different orders of magnitude this section lists lengths between 10 −11 and 10 −10 m (10 pm and 100 pm). 25 pm – approximate radius of a helium atom, the smallest neutral atom. 30.8568 pm – 1 rontoparsec. 50 pm – radius of a hydrogen atom. 50 pm – bohr radius: approximate radius of a hydrogen atom.