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

85 – At – Astatine

At At-218 (half life 1.6 seconds) is part of the decay chain of U-238, so traces of Astatine exist in the pitchblende shown here. Amount: 0.2 g pitchblende, corresponding to 0.002 ag or 6 atoms of At-218.

Physical and chemical data
Atomic mass209.9871
Density? g·cm-3
Melting point302 °C
Boiling point337 °C
Abundance3.00e-24 %
Electronegativy2
Oxydation levels7, 5, 3, 1, [-1]
Electron configuration[Xe]4f14 5d10 6s2 6p5

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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