Arsenic is a chemical element from the periodic table. It is a grayish-white, brittle semimetal that is found in many minerals. Arsenic is commonly used in alloys, pesticides, wood preservatives and other industrial processes. It is also used in some medical treatments for certain types of cancer.
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| Atomic number | 33 |
| Group | VA |
| Period | 4 |
| Mass | 74.9216 |
| Latin name | Arsenicum |
| Electron configuration | [Ar]3d10 4s2 4p3 |
| Oxidation state | -3, -2, -1, 0, 1, 2, 3, 4, 5 |