AtZ =  85

From the Greek "astatos", meaning "unstable"
(AM) Atomic Mass 209  amu    Oxidation States +1, -1
   (BP) Boiling Point 962  °C    (MP) Melting Point 254  °C
   (ρ) Density 9.4  g/cm3    Crystal Structure n/a
   ( χ ) Electronegativity 2    (AR) Atomic Radius 1.53  Å
   Physical State Solid (C) Heat Capacity n/a
Electronic-Config [Xe]  4f14  5d10  6s2  6p5     (I1) First Ionization E 931.08  kJ/mol
   (ΔHvap) Heat of Vaporization 40  kJ/mol     (ΔHfus) Heat of Fusion 6  kJ/mol
   Year of Discovery 1940    Location of Discovery U. Cal, Berkley
(E°) Standard Potential None
Stable isotopes None. All natural isotopes are radioactive
Discovered/Synthesized by Dale R. Carson, K.R. MacKenzie, Emilio Segrč
Natural Source Isolated from the decay of radioactive elements
Common Uses Cancer medicine
Other Info Considered to be the rarest of all elements due to very short radioactive half life
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