A deep dive into protactinium, from Mendeleev’s eka-tantalum prediction to its isolation in 1934, and its place between thorium and uranium in the actinide series. We explore its rare, highly radioactive nature, key isotopes (Pa-231 and Pa-233), and how it’s sourced—from uranium ores to spent nuclear fuel. Learn how protactinium dating helps reconstruct ancient ocean circulation and sediment histories, plus the safety considerations and why this once- obscure element reveals surprising insights about Earth’s past.

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