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Protactinium
A rare radioactive metal found in U and Th ores where it forms as a transient decay product. The longest lived isotope has a half life of 35,000 years.
 Radiation symbol Radiation symbol.
This unavailable element is represented by a radiation hazard symbol. If we had a visible quantity on display here, you would be dead.
Source: n/a
Size: n/a
Purity: n/a