Wikipedia describes arsenic as "the chemical element
that has the symbol As, atomic number 33 and atomic mass 74.92. Arsenic was first
documented by Albertus Magnus in 1250.[4] Arsenic is a notoriously poisonous
metalloid with many allotropic forms, including a yellow (molecular non-metallic)
and several black and grey forms (metalloids). Three metalloidal forms of arsenic,
each with a different crystal structure, are found free in nature (the minerals
arsenic sensu stricto and the much rarer arsenolamprite and pararsenolamprite). However,
it is more commonly found as arsenide and in arsenate compounds, several hundred of
which are known. Arsenic and its compounds are used as pesticides, herbicides,
insecticides and in various alloys."
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