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|
Arsenic
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| As | 33 | 74.92160 | 817 °C | 614 °C | Solid | 5.727 g/cm3 | Semi-Metal  |
|
|
|
| General |
| Name, Symbol, Number |
arsenic, As, 33 |
| Chemical series |
metalloids |
| Group, Period, Block |
15, 4, p |
| Appearance |
metallic gray
 |
| Standard atomic weight |
74.92160(2) g·mol−1 |
| Electron configuration |
[Ar] 3d10 4s2 4p3 |
| Electrons per shell |
2, 8, 18, 5 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
5.727 g·cm−3 |
| Liquid density at m.p. |
5.22 g·cm−3 |
| Melting point |
1090 K
(817 °C, 1503 °F) |
| Boiling point |
subl. 887 K
(614 °C, 1137 °F) |
| Critical temperature |
1673 K |
| Heat of fusion |
(gray) 24.44 kJ·mol−1 |
| Heat of vaporization |
? 34.76 kJ·mol−1 |
| Heat capacity |
(25 °C) 24.64 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
553 |
596 |
646 |
706 |
781 |
874 |
|
| Atomic properties |
| Crystal structure |
rhombohedral |
| Oxidation states |
±3, 5
(mildly acidic oxide) |
| Electronegativity |
2.18 (scale Pauling) |
Ionization energies
(more) |
1st: 947.0 kJ·mol−1 |
| 2nd: 1798 kJ·mol−1 |
| 3rd: 2735 kJ·mol−1 |
| Atomic radius |
115 pm |
| Atomic radius (calc.) |
114 pm |
| Covalent radius |
119 pm |
| Van der Waals radius |
185 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(20 °C) 333 n Ω·m |
| Thermal conductivity |
(300 K) 50.2 W·m−1·K−1 |
| Young's modulus |
8 GPa |
| Bulk modulus |
22 GPa |
| Mohs hardness |
3.5 |
| Brinell hardness |
1440 MPa |
| CAS registry number |
7440-38-2 |
| Selected isotopes |
|
|
| References |
|
Arsenic Compounds
|
Source: Wikipedia article Arsenic
|
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Chemistry Quick Facts
