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What is the plural of protactinium?

What's the plural form of protactinium? Here's the word you're looking for.

Answer

The noun protactinium is uncountable.

The plural form of protactinium is also protactinium.

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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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