World Of Taxonomy
D011478Level 6

Protactinium

**Definition:** 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.

**Tree numbers:** - D01.268.271.100.725 - D01.268.556.750 - D01.496.749.305.100.725 - D01.552.020.778 - D01.552.544.750

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