Also known as: PA., PA..., PA-
PA stands for various terms. Discover the full forms, meanings, and possible interpretations of PA across different fields and industries.
Symbol:"Pa" Atomic Number:"91" Atomic Mass: 231.04amu. Protactinium is one of the elements in the actinide series of inner transition elements. It may also be classified as a rare earth element. It is a radioactive and unstable element and you will not find it in use anywhere.
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