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Arsenic is a poisonous metalloid.
What does it look, feel, taste, or smell like?
The most stable — and therefore the most common — form of pure arsenic is gray. There are also yellow and black forms. Yellow arsenic is the most unstable and the most toxic.
How was it discovered?
Compounds of arsenic have been known since ancient times — arsenic sulfates, and arsenic oxides. Pure arsenic is rare in nature. As far as we know, the first person to isolate pure arsenic was Albertus Magnus, a German friar and bishop, around the year 1250 CE.
Where did its name come from?
Where is it found?
Arsenic is a fairly common element on Earth. A lot of it is mined China. Other countries that mine a fair amount of arsenic are Cile, Peru, and Morocco.
What are its uses?
Arsenic is used in some alloys to make them harder. It was sometimes used in ancient times to make bronze harder. It is also used in some pesticides, although these are not used as much as they used to be because of concerns it could hurt people if it gets on their food.
Is it dangerous?
Arsenic is poisonous. It is used in pesticides.