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protactinium
Atomic number:
91
Atomic weight:
231.03588
Symbol:
Pa
Group number:
(actinide)
Electronic configuration:
[Rn].5f2.6d1.7s2
Physical data
Standard state:
solid at 298 K
Colour:
silvery metallic
Density of solid at ambient temperature/kg m-3:
15370
Molar volume/cm3:
15.18
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