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: [[Proton]]s have a [[Relative Atomic Charge|relative atomic charge]] of +1 so the number of [[proton]]s determines the [[Relative Atomic Charge|relative atomic charge]] of the [[Atomic Nucleus|atomic nucleus]].
: 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'''
| style="height:20px; width:200px; text-align:center;" |'''Lithium'''
| style="height:20px; width:200px; text-align:center;" |'''Beryllium'''
|-
|[[File:Hydrogen.png|center|200px]]
|[[File:Helium.png|center|200px]]
|[[File:Lithium.png|center|200px]]
|[[File:Beryllium.png|center|200px]]
|-
|[[File:HydrogenSymbol.png|center|200px]]
|[[File:HeliumSymbol.png|center|200px]]
|[[File:LithiumSymbol.png|center|200px]]
|[[File:BerylliumSymbol.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |[[Hydrogen]] has 1 [[proton]] so its '''atomic number''' is 1 and the [[Relative Atomic Charge|relative atomic charge]] of the [[Atomic Nucleus|nucleus]] is +1.
| style="height:20px; width:200px; text-align:center;" |[[Helium]] has 2 [[proton]]s so its '''atomic number''' is 2 and the [[Relative Atomic Charge|relative atomic charge]] of the [[Atomic Nucleus|nucleus]] is +2.
| style="height:20px; width:200px; text-align:center;" |[[Lithium]] has 3 [[proton]]s so its '''atomic number''' is 3 and the [[Relative Atomic Charge|relative atomic charge]] of the [[Atomic Nucleus|nucleus]] is +3.
| style="height:20px; width:200px; text-align:center;" |[[Beryllium]] has 4 [[proton]]s so its '''atomic number''' is 4 and the [[Relative Atomic Charge|relative atomic charge]] of the [[Atomic Nucleus|nucleus]] is +4.
|}