AsZ =  33

From the Greek "arsenikon", meaning "orpiment"
(AM) Atomic Mass 74.92159  amu    Oxidation States +3, +5, -3
   (BP) Boiling Point 613  °C    (MP) Melting Point 817  °C
   (ρ) Density 5.72  g/cm3    Crystal Structure Rhombohedral
   ( χ ) Electronegativity 2    (AR) Atomic Radius 1.19  Å
   Physical State Solid (C) Heat Capacity 0.329  J/g °C
Electronic-Config [Ar]  3d10  4s2  4p3     (I1) First Ionization E 946.52  kJ/mol
   (ΔHvap) Heat of Vaporization 32.4  kJ/mol     (ΔHfus) Heat of Fusion 24.44  kJ/mol
   Year of Discovery Known to the Ancients    Location of Discovery n/a
(E°) Standard Potential H3AsO4 + 3 H+⇔ As + 3 H2O (0.250 V),  As + 3 H+⇔ AsH3 (-0.600 V)
Stable isotopes  75As
Discovered/Synthesized by Known since ancient times
Natural Source The mineral/ore arsenopyrite
Common Uses Poisons, semiconductors, light-emitting diodes, signal lights, tiny lasers
Other Info One of the most popular poisons throughout the ages
Some bacteria may use arsenic in place of phosphorus.
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