Periodic Table of the Elements
Periodic Table




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name Protactinium
latin Protactinium
french Protactinium
german Protactinium
symbol Pa
proton number 91
atomic weight 231.03588
Pauling electronegativity 1.5
electronic configuration [Rn] 5f26d17s2
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melting point 1841 K, 1568°C, 2854°F
boiling point -
group -
period 7
state (by 20°C) solid
oxidation states +4, +5
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Year of discovery Discoverers
1913 Otto Hahn (1879-1968)
Lise Meitner (1878-1968)
Frederick Soddy (1877-1956)
John Cranston

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