← Periodic Table
33As74.922
Arsenic
MetalloidArsenic 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.
Phase: SolidAppearance: metallic grey
2, 8, 18, 5
Physical Properties
Atomic Mass74.9215956 u
Density5.727 g/cm³
Molar Heat24.64 J/(mol·K)
Period4
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3
Semantic Config[Ar] 3d10 4s2 4p3
Shells2, 8, 18, 5
Electron Affinity77.65 kJ/mol
Electronegativity2.18
Ionization Energies
IE1: 947 kJ/molIE2: 1798 kJ/molIE3: 2735 kJ/molIE4: 4837 kJ/molIE5: 6043 kJ/molIE6: 12310 kJ/mol
Discovery
Discovered byBronze Age