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Protactinium

(Pa)

Category

Actinoid

Series

actinide

Relative atomic mass

231.03588

Density

15.37

Melting point (°C)

1845

Boiling point (°C)

3977

Electronegativity (Pauling)

1.3

Discovery year

1917

Discovered by

Ernest Rutherford

created by @lukaswyss

Protactinium (Pa) – Element 91