Fred Bayer | Rosenheim | Germany | (+49) 8031 86550 | fred@bayerf.de

91 – Pa – Protactinium

Pa Pa-231 (half life 32700 years) is part of the decay chain of U-235, so traces of Protactinium exist in the pitchblende shown here. Amount: 0.2 g pitchblende, corresponding to 37 ng or 100 trillion atoms of Pa-231.

Physical and chemical data
Atomic mass231.03588
Density15.37 g·cm-3
Melting point1572 °C
Boiling point4227 °C
Abundance9.00e-11 %
Oxydation levels[5], 4
Electron configuration[Rn]5f2 6d 7s2

  H   He
Li Be   B C N O F Ne
Na Mg   Al Si P S Cl Ar
K Ca Sc   Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y   Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac Th Pa U Np Pu Am Cm  
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