 |
| General |
| Name | Arsenic |
| Symbol | As |
| Number | 33 |
| Group Number | 15 |
| Group | Non-Metal, Nitrogen group |
| Block | p |
| Density | 5.72 g/cm3 |
| Atomic Weight | 74.9216 g/mol |
| Atomic Volume | 13.1 cm3/mol |
| Discover | 1600 |
|
| States |
| State | Solid |
| Melting Point | 1090 K |
| Boiling Point | 887 K |
| Triple Point | Nil |
| Critical Point | 1673 K |
| Heat of Fusion | 24.44 kJ/mol |
| Heat of Vaporization | 34.76 kJ/mol |
|
| Energies |
| First Ionization Energy | 946.5 kJ/mole |
| Second Ionization Energy | 1797.8 kJ/mole |
| Third Ionization Energy | 2735.4 kJ/mole |
| Electronegativity | 2.18 |
| Electron Affinity | 78 kJ/mole |
| Specific Heat | 0.33 J/gK |
| Heat Atomization | 302 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,5 |
| Electron Configuration | [Ar] 3d10 4s2 4p3 |
| Minimum Oxidation Number | -3 |
| Maximum Oxidation Number | 5 |
| Minimum Common Oxidation Number | -3 |
| Maximum Common Oxidation Number | 5 |
|
| Appearance and Characteristics |
| Crystal Structure | rhombohedral |
| Characteristics | semimetal, brittle, 3 forms |
| Color | gray |
| Uses | photocells (GaAs), poisons |
| Hardness | 3.5 mohs |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | mild, w/ht =>As4O6 |
| Reaction with 6M HCl | None |
| Reaction with 15M HNO3 | mild, w/ht =>H3AsO4, NOx |
| Reaction with 6M NaOH | None |
|
| Other Forms |
| Number of Isotopes | 1 |
| Hydride | AsH3 |
| Oxide | As2O3 |
| Chloride | AsCl3 AsCl5 |
|
| Radius |
| Atomic Radius | 120 pm |
| Ionic Radius (1+ ion) | Nil |
| Ionic Radius (1- ion) | Nil |
| Ionic Radius (2+ ion) | Nil |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | 72 pm |
|
| Conductivity |
| Thermal Conductivity | 50.2 J/m-sec-deg |
| Electrical Conductivity | 30.03 1/mohm-cm |
| Polarizability | 4.3 A3 |
|
| Abundance |
| Source | Arsenopyrite, enargite (misc) |
| Relation Abundance Solar System | 0.817 log |
| Abundance Earth's Crust | 0.3 log |
|
