33Solid
As 74.922 Atomic mass · uMetalloids
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.
Discovery Ancient (Bronze Age)
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Physical properties
Values for the element in its standard state.
- Density
- 5.727g/cm³
- Melting point
- 1,090K
- Boiling point
- 887K
- Atomic radius
- 119pm
- Bonding type
- Metallic
- Molar heat
- 24.64J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 3 electrons;
[Ar] represents 18 core electrons. The full view shows them explicitly.
33 electrons Orbital order preserved from source
- Electronegativity
- 2.18Pauling scale
- First ionization energy
- 947kJ/mol
- Electron affinity
- 78kJ/mol
- Van der Waals radius
- 185pm
As ArsenicAtomic number 33
947kJ/mol
Atomic numberGaps indicate unavailable data
About arsenic
- Appearance
- Metallic grey
- Discovery
- Ancient (Bronze Age)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.