Pa

Protactinium

Z 91 231.036 g/molActinide Radioactive

Overview Atomic Properties Thermodynamics Electromagnetism Isotopes

Group

3

Period

7

Block

f

Occurrence

From decay

Biological Role

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History

1913 (discovery)

Kasimir Fajans, Oswald Helmuth Göhring

1934 (isolation)

Aristid von Grosse

Named By

Otto Hahn, Lise Meitner

Latin Name

Protactinium

Abundance

Universe

x

Sun

x

Meteorites

x

Earth's crust

x

Oceans

x

Humans

x