Arsenic
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Arsenic is a chemical element; it has the symbol As and atomic number 33. It is a metalloid and one of the pnictogens, and therefore shares many properties with its group 15 neighbors phosphorus and a
Arsen 1a
Gray arsenic nodule
A large sample of native arsenic from Sainte-Marie-aux-Mines, France
Realgar
Germanium
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Germanium is a chemical element; it has the symbol Ge and atomic number 32. It is lustrous, hard-brittle, grayish-white and similar in appearance to silicon. It is a metalloid in the carbon group that
Arsenic
…As3− ion as the formation of such an anion would be highly endothermic and even the group 1 arsenides have properties of intermetallic compounds. Like germanium, selenium, and bromine, which like arsenic succeed the 3d transition series, arsenic is much less stable in the +5 oxidation state than its vertical…
Polycrystalline germanium
Renierite
A PET bottle