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==Key Stage 3==
===Meaning===
[[File:ProtactiniumSymbolProtactiniumSymbol1.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Protactinium]].]]
[[Protactinium]] is a [[Actinide]] [[metal]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 91.