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

93 – Np – Neptunium

Np Np-237 (half life 2.14 million years) is produced by nuclear reactions in U-238, so traces of Neptunium exist in the pitchblende shown here. Amount: 0.4 g pitchblende, corresponding to 47 fg or 120 million atoms of Np-237.

Physical and chemical data
Atomic mass237.0482
Density20.48 g·cm-3
Melting point639 °C
Boiling point3902 °C
Abundance4.00e-17 %
Electronegativy1.2
Oxydation levels6, [5], 4, 3
Electron configuration[Rn]5f4 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 Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg  
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