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| style="height:20px; width:200px; text-align:center;" |[[Beryllium]] has 4 [[proton]]s so its '''atomic number''' is 4.
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==Key Stage 4==
===Meaning===
[[File:ElementTile.png|right|400px|thumb|An [[element]] tile showing the [[Atomic Number]].]]
The [[Atomic Number]] is the number of [[proton]]s in the [[nucleus]] of an [[atom]].
===About The Atomic Number===
: The [[Atomic Number]] of an [[atom]] determines which [[element]] it is.
: [[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]].