protoactinium in English
noun
1
the chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium.
Along the way, these disintegration series produce radioactive isotopes of protactinium , thorium, actinium, radium, francium, radon, astatine, polonium, bismuth, lead, thallium and mercury.
noun
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