In nature, there are a lot of elements, these elements are invisible, but they have a very important position.These elements are constantly in the chemical reaction, thus building the world we see now.。
Arsenic, commonly known as arsenic, is a kind of metallic element in the periodic table of the chemical elements in the fourth cycle, VA, atomic number 33, symbol As, elemental arsenic and arsenic in grey black and yellow as the three allotropic forms. Arsenic is widely found in nature, and hundreds of arsenic minerals have been discovered. Arsenic and its compounds are used in pesticides, herbicides, pesticides, and many kinds of alloys. The compound is called arsenic trioxide arsenic is a highly toxic substance.
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