Arsenic is the 53rd most abundant element in the Earth’s crust, comprising about 1.5 parts per million (0.00015%). [citation needed] Typical background concentrations of arsenic do not exceed 3 ng/m 3 in the atmosphere; 100 mg/kg in soil; 400 μg/kg in vegetation; 10 μg/L in freshwater and 1.5 μg/L in seawater.. The number of protons determines the element, but the number of neutrons in the atom of any one element can vary. Each variation is an isotope. About 14 radioactive isotopes of arsenic are known also.
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Protons: 33: Neutrons in most abundant isotope: 42: Electron shells: 2,8,18,5 : Electron configuration:. Minimum oxidation number-3 : Min. common oxidation no.-3 : Maximum oxidation number : 5 :. Arsenic is immediately dangerous to life or health at 5 mg m-3.. Arsenic (As) Arsenic is the 33rd element in the periodic table and has a symbol of As and atomic number of 33. It has an atomic weight of 74.92159 and a mass number of 75. Arsenic has thirty-three protons and forty-two neutrons in its nucleus, and thirty-three electrons in four shells. It is located in group fifteen, period four and block p of.
