Canadian Medical Guide > Chemicals and Drugs > Inorganic Chemicals > Elements > Actinoid Series Elements > Protactinium Terms and Definitions
Protactinium
| Medical Definition: | Protactinium. 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. | |
| Guide Notes: | naturally radioactive; IM | |
| CAS Type 1 Name: | CAS Number: | 7440-13-3 |
Protactinium Medical Definitions and Terms
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