ARSENIC

It is a chemical element table periodic which symbol is An Ace and the atomic number is 33. The arsenic appears solidly, principally in the shape of sulphurs. It belongs to the metalloids, since it shows intermediate properties between the metals and not metals.
The arsenic, of the Greek arsenikón (άρσενιχόν), that it means oropimente yellow.
Compounds of arsenic are known from the antiquity, being extremely toxic, though they use as components in some medicines.
Schroeder obtained it in 1649 for the action of the coal on the arsenic acid.
Information obtained of www.wikipedia.org