element pa

Protactinium is a chemical element; it has symbol Pa and atomic number 91. It is a dense, radioactive, silvery-gray actinide metal which readily reacts with ...

Protactinium is a highly radioactive and highly toxic element with yet no commercial applications but nevertheless of some scientific interest.

Protactinium is a chemical element with symbol Pa and atomic number 91. Classified as an actinide, Protactinium is a solid at 25°C (room temperature).

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Protactinium (Pa), radioactive chemical element of the actinoid series of the periodic table, rarer than radium; its atomic number is 91.

Protactinium (Pa) is a rare and radioactive element with the atomic number 91, belonging to the actinide series of the periodic table.

2 aug. 2019 — Protactinium is a radioactive element predicted to exist in 1871 by Mendeleev, although it was not discovered until 1917 or isolated until 1934.

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