#33
Arsenic
metalloid· Solid·74.9215956 u
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.
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Identity
- Symbol
- As
- Atomic Number
- 33
- Atomic Mass
- 74.9215956 u
- Category
- metalloid
- Block
- p-block
- Period
- 4
- Group
- 15
- Appearance
- metallic grey
- Year Discovered
- Ancient
- Discovered By
- Bronze Age
- Named By
- virility
Electrons
- Configuration
- [Ar] 3d10 4s2 4p3
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3
- Shells
- 2, 8, 18, 5
- Electronegativity
- 2.18
- Electron Affinity
- 77.65
- Oxidation States
- +5, +3, -3
- Ionization Energies
- 947, 1798, 2735, 4837, 6043 … +1 more
Physical Properties
- State at
- Solid
- Melting Point
- n/a
- Boiling Point
- 887
- Density
- 5.727
- Molar Heat
- 24.64 J/(mol·K)
- Crystal Structure
- Rhombohedral
- Magnetic Ordering
- Diamagnetic
Mechanical
- Atomic Radius
- 114 pm
- Covalent Radius
- 119 pm
- Van der Waals
- 185 pm
- Mohs Hardness
- 3.5
- Bulk Modulus
- 22 GPa GPa
- Shear Modulus
- 11 GPa GPa
- Young's Modulus
- 8 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 50.2 W/(m K) W/(m·K)
- Electrical Conductivity
- 3.45 MS/m S/m
- Specific Heat
- 329 J/(kg K) J/(g·K)
- Heat of Vaporization
- 32.4 kJ/mol kJ/mol
- Heat of Fusion
- 24.4 kJ/mol kJ/mol
Abundance
- Universe
- 8.00 ppb
- Sun
- 6.00 ppb
- Meteorite
- 1.8 ppm
- Earth's Crust
- 5.73 ppm
- Ocean
- 3.70 ppb
- Human Body
- 50.0 ppb