Arsenic (As), element 33 – Learn Acer periodic table

Metalloid, atomic number 33.

Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.

Symbol As. Atomic mass 74.9215956 u. Group 15, period 4. Electron configuration [Ar] 3d10 4s2 4p3. Electrons per shell 2, 8, 18, 5. State at room temperature: Solid. Melting point 816.9 °C, boiling point unknown. Discovered by Bronze Age.

Element data from Wikipedia, CC BY-SA 3.0.

Arsenic (As), element 33 – Learn Acer periodic table

Arsenic

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