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To help compare different orders of magnitude this page lists lengths between 100 pm and 1 nm (10-10 m and 10-9 m). See also lengths of other orders of magnitude. Lengths shorter than 100 pm 100 pm = 1 Ångström 100 pm (0.1 nm) -- covalent radius of sulfur atom 126 pm (0.126 nm) -- covalent radius of ruthenium atom 135 pm (0.135 nm) -- covalent radius of technetium atom 153 pm (0.153 nm) -- covalent radius of silver atom 154 pm (0.154 nm) -- length of a typical covalent bond (C-C). 155 pm (0.155 nm) -- covalent radius of zirconium atom 225 pm (0.225 nm) -- covalent radius of cesium atom 500 pm (0.50 nm) -- width of protein α helix Lengths longer than 1 nm 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)