What is Neutron?
[[File:Neutron quark structure.svg|200px|thumb|right|A picture of a neutron. The 'u' stands for an up quark, and the 'd' stands for a down quark.]] '''Neutrons''', with [[protons]] and [[electrons]], make up an [[atom]]. Neutrons and protons are found in the [[Nucleus (physics)|nucleus]] of an atom.<ref name=igcse>{{cite book|author=Woolley, Steve|title=Edexcel IGCSE Physics Revision Guide|url=https://archive.org/details/edexceligcsephys0000wool|date=2011|publisher=Pearson Education|page=[https://archive.org/details/edexceligcsephys0000wool/page/20 20]-21|isbn=9780435046736}}</ref><ref name=cox /><ref name=nave /> Unlike protons, which have a positive charge, or electrons, which have a negative charge, neutrons have [[zero]] charge<ref name=igcse /><ref>{{cite book|author=Ryan, Lawrie|title=Chemistry for you: revised National Curriculum edition for GCSE|url=https://archive.org/details/chemistryforyou0000ryan|date=2001|edition=Second|publisher=Nelson Thornes|isbn=9780748762347|page=[https://archive.org/details/chemistryforyou0000ryan/page/29 29]}}</ref> which means they are [[neutral particle]]s. Neutrons bind with protons with the residual [[strong force]]. Neutrons were predicted by [[Ernest Rutherford]],<ref>{{cite web |title=Ernest Rutherford |url=http://chemed.chem.purdue.edu/genchem/history/rutherford.html |website=chemed.chem.purdue.edu}}</ref> and discovered by [[James Chadwick]],<ref name=b /><ref>{{cite web|url=http://nobelprize.org/nobel_prizes/physics/laureates/1935/|title=The Nobel Prize in Physics 1935: James Chadwick|publisher=Nobelprize.org|accessdate=2011-04-15}}</ref> in 1932.<ref name=b>{{cite web|url=http://www.helmholtz-berlin.de/angebote/arbeiten-lernen/info/neutronen/entdeckung_en.html#c22033|title=Discovery of Neutrons|publisher=Helmholtz Zentrum Berlin|accessdate=2011-04-14|date=2008-08-23|archive-date=2010-11-13|archive-url=https://web.archive.org/web/20101113195437/http://www.helmholtz-berlin.de/angebote/arbeiten-lernen/info/neutronen/entdeckung_en.html#c22033|url-status=dead}}</ref>