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The first isotope of protactinium (234mPa) was discovered by Kasimir Fajans and Otto Gohring in 1913 (Germany).

The isotope 231Pa of protactinium was discovered by Austrian/Jewish physicist Lise Meitner and by Otto Hahn, a German physical chemist in 1918 and simultaneously by Frederick Soddy and John Cranston (England).

Protactinium exist in very low concentrations in uranium ores.

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∙ 16y ago

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