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==Key Stage 5==
===Meaning===
The [[Atomic Number|atomic number]] is the number of [[proton]]s in the [[Atomic Nucleus|nucleus]] of an atom, determining the chemical properties of an [[element]].
===About the Atomic Number===
*Defines the identity of an [[element]] (e.g., [[hydrogen]] has Z = 1).
*[[Element]]s in the [[Periodic Table|periodic table]] are ordered by increasing [[atomic number]].
*The [[Atomic Number|atomic number]] determines the [[element]]'s position in the [[Periodic Table|periodic table]].*The number of [[proton]]s is equal to the number of [[electronselectron]] s in a [[Neutral Charge|neutral ]] [[atom]].
*The [[atomic number]] is unique for each [[element]] and distinguishes one [[element]] from another.
*Changes in the [[Atomic Number|atomic number]] result in the formation of different [[element]]s through [[Nuclear Reaction|nuclear reactions]].
===Examples===
*[[Carbon]] has an [[atomic number]] of 6.
*The [[atomic number]] of [[uranium]] is 92.