| Arsenic | |
| Electrons per shell | 2,8,18,5 |
| Electron Configuration | [Ar] 3d10 4s2 4p3 ![]() |
| Ground state | 4S°3/2 |
| Atomic Volume | 13.1 cm3 mol-1 |
| Electronegativity | 2.18 |
| Magnetic ordering | No data |
| Mass magnetic susceptibility | -3.9 x 10-9 |
| Molar magnetic susceptibility | -2.92 x 10-10 |
Thermal Properties |
|
| Enthalpy of Atomization | 301.3 kJ mol-1 @25°C |
| Enthalpy of Fusion | 27.7 kJ mol-1 |
| Enthalpy of Vaporisation | 31.9 kJ mol-1 |
| Heat Capacity | 24.64 J mol-1 K-1 |
| Thermal Conductivity | 50.2 W m-1 K-1 |
| Thermal Expansion | No data. |
| Critcal Temperature | 1700 K (1427°C) |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Hardness |
|
| Brinell hardness | 1440 MPa |
| Mohs hardness | 3.5 |
Elastic Properties |
|
| Bulk modulus | 22 GPa |
| Young's modulus | 8 GPa |
Electrical Properties |
|
| Electrical resistivity | 3.0 x 10-7 Ω m |
| Electrical conductivity | 0.0345 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 0.93177 g Ah-1 |
| Electron Work Function | 3.75 eV |
| Valence Electron Potential (-eV) | 74 |
| Ionization Potential | |
| 9.81 | |
| 16.633 | |
| 28.351 | |
| Incompatibilities | Halogenated compounds, rubidium, carbide. |
Optical Properties |
|
| Refractive Index (solid) | 1.001552 |
Energy Levels |
|
| 10.54372 KeV | |
| 10.50799 KeV | |
| 11.7262 KeV | |
| 11.7184 KeV | |
| 1.282 KeV | |
| 1.282 KeV | |
| 1.317 KeV | |
| 1.3835 KeV | |
| 1.388 KeV | |
| 1.155 KeV | |
| 1.1207 KeV | |
Atomic Radii |
|
| 115 pm | |
| 114 pm | |
| 119 pm | |
| 185 pm | |
| 106 pm | |
| No data. | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 3 | VI | 0.72 | 0.58 | A |
| 5 | IV | 0.475 | 0.335 | R* |
| VI | 0.6 | 0.46 | C* | |
| R, From r3 vs V plots. |
| C, Calculated from bond length - bond strength equations. |
| E, Estimated. |
| *, Most Reliable. |
| M, From Metallic Oxides. |
| A, Ahrens (1952) Ionic radius. |
| P, Pauling's (1960) Crystal Radius. |
Oxidation States |
|
| As+3, As+5 | |
| As-3 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 947 | |
| 1798 | |
| 2735 | |
| 4837 | |
| 6042 | |
| 12305 | |
| 15400 | |
| 18900 | |
| 22600 | |
| 26400 | |
Covalent Bonds (kJ mol-1) |
|
| 245 | |
| 200 | |
| 477 | |
| 464 | |
| 293 | |
| 348 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 553 | 596 | 646 | 706 | 781 | 874 |
Crystal Structure |
|
| Trigonal | |
![]() |
a = 375.98 pm |
| b = 375.98 pm | |
| c = 1054.75 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |