Protactinium

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en: Protactinium   –   de: Protactinium   –   fr: Protactinium   –   ja: プロトアクチニウム   –   ru: Протактиний
Position in the periodic table symbol: Pa atomic number: 91 chemical series: actinides
		File:Pa,91.jpg
		sample	electron shell

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Imitation of protactinium