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*Denoted by the symbol Z.
*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|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 [[electron]]s in a [[Neutral Charge|neutral]] [[atom]].
*The [[Atomic Number|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|atomic number]] of 6.*The [[Atomic Number|atomic number]] of [[uranium]] is 92.