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What is protactinium?

What is protactinium? Here are some definitions.

Noun
  1. A chemical element (symbol Pa) with atomic number 91.
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The first four actinide elements, actinium, thorium, protactinium and uranium are naturally occurring and have been known for a considerable time.
The dates of discovery of these elements as 1789 for uranium, 1829 for thorium, 1899 for actinium and 1913 for protactinium.

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