Science Facts


23 Jul , 2014  

protonsEveryday objects are made of atoms and every atom contains one or more protons. The simplest atom—hydrogen—consists of one proton and one electron. A proton can be modeled as a tiny ball with a constant radius. Using data from experiments with hydrogen, scientists have estimated the radius of the proton. Their current best estimate (the CODATA 2010 value) is 0.8775 femtometers, with an uncertainty of plus or minus 0.0051 femtometers. A femtometer (fm) is one quadrillionth of a meter. More…