33 As 74.922
Arsenic
metalloid
Properties
- Atomic number
- 33
- Atomic mass
- 74.922 u
- Category
- metalloid
- Group
- 15
- Period
- 4
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 5
- Electronegativity
- 2.18 (Pauling)
- Density
- 5.727 g/cm³
- Melting point
- —
- Boiling point
- —
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³
Noble-gas shorthand: [Ar] 3d¹⁰ 4s² 4p³
Electrons per shell: 2, 8, 18, 5 — that's 5 in the outermost shell.
About Arsenic
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.
- Discovered by Bronze Age
- Appearance: metallic grey
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.