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Period 4 element
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===Arsenic=== [[File:Arsen 1a.jpg|frameless|left|upright=0.3]] [[Arsenic]] (As) is an element in [[pnictogen|group 15]], the pnictogens. Arsenic, as mentioned above, is often used in semiconductors in alloys with germanium. Arsenic, in pure form and some alloys, is incredibly poisonous to all multicellular life, and as such is a common component in pesticides. Arsenic was also used in some pigments before its toxicity was discovered.
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