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====OCR====
:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Atomic (proton) number, pages 15, 16, GCSE Chemistry; The Revision Guide, CGP, OCR Gateway '']
==Key Stage 5==
===Meaning===
The [[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===
*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]].
*The [[atomic number]] determines the [[element]]'s position in the [[Periodic Table|periodic table]].
*The number of [[proton]]s is equal to the number of [[electrons]] in a neutral atom.
*The [[atomic number]] is unique for each [[element]] and distinguishes one [[element]] from another.
*Changes in the [[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.