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To help compare different orders of magnitude this page lists lengths between 10 pm and 100 pm (10-11 m and 10-12 m). See also lengths of other orders of magnitude. Lengths shorter than 10 pm 25 pm -- radius of Hydrogen atom 31 pm -- radius of Helium atom 100 pm = 1 Ångström Lengths longer than 100 pm External links Conversion Calculator for Units of LENGTH (http://www.ex.ac.uk/cimt/dictunit/ccleng.htm) Atomic radii come from www.webelements.com (http://www.webelements.com)