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,→The Addition of the Neutron
: In 1913 [[Neils Bohr]] added to the [[Nuclear Model]] when he proposed that [[electron]]s could only [[orbit]] the [[Atomic Nucleus|nucleus]] in specific [[Electron Orbital|electron orbitals]] or 'shells' creating the [[Bohr 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 out modern understanding of the [[atom]].