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: The number of [[electron]]s [[orbit]]ing the [[Atomic Nucleus|nucleus]] is the same as the number of [[proton]]s in the [[Atomic Nucleus|nucleus]] of an [[atom]].
===Examples==={| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |'''Hydrogen'''
| style="height:20px; width:200px; text-align:center;" |'''Helium'''