Protactinium

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en: Protactinium   –   de: Protactinium   –   fr: Protactinium   –   ja: プロトアクチニウム   –   ru: Протактиний
Pa-TableImage.png
Position in the periodic table
symbol: Pa
atomic number: 91
chemical series: actinides
Electron shell 091 Protactinium.svg
sample
electron shell

Miscellaneous[edit]