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A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission.

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Tree Number(s): D01., D01.268.556.750, D01.496.749.305.100.725, D01.552.020.778, D01.552.544.750

MeSH Unique ID: D011478

Registry Number: 0S6855V29M

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