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Atom
,→The Addition of the Neutron
: In 1919 [[Ernest Rutherford]] determined that the [[Hydrogen]] [[nucleus]] was present in all [[Atomic Nucleus|atomic nuclei]]. This introduced the [[proton]] to the model of the [[atom]].
====The Addition of the Neutron====
: In 1932 [[James Chadwick]] discovered a [[Neutral Charge|neutral]] [[Subatomic Particle|subatomic particle]] which he named a [[Neutron]]. This [[neutron]] explained the existence of [[isotope]]s and completed our modern understanding the model of the [[atom]] studied at GCSE.====The Electron Cloud====: ''NB: You don't need to know this'' The model of the [[atom]] was soon updated by [[Werner Heisenberg]] who determined that the exact position and velocity of [[electron]]s could not be known and so they do not '[[orbit]]', rather they exist in a cloud of probable locations around the [[nucleus]].
====Extra Information====