| Atomic Number: | 33 |
| Element Symbol: | As |
| Element Name: | Arsenic |
| Atomic Weight: | 74.92160 |
| Group Number: | 15 |
| Group Name: | Pnictogen |
| Period Number: | 4 |
| Block: | p-block |
| Ground State Configuration: | [Ar] 3d10 4s2 4p3 |
| Ground State Level: | 4So3/2 |
| Standard State: | Solid |
| Common Valences: | 3,5 |
| Bond Length: | 249 |
| Atomic Radius Empirical: | 115 |
| Atomic Radius Calculated: | 114 |
| Covalent Radius Empirical: | 119 |
| Vander Waals Radius: | 185 |
| Electron Affinity: | 78 |
| First Ionization Energy: | 947.0 |
| Pauling Electronegativity: | 2.18 |
| Sanderson Electronegativity: | 2.82 |
| Allred Rochow Electronegativity: | 2.20 |
| Mulliken Jaffe Electronegativity: | 2.26 |
| Allen Electronegativity: | 2.211 |
| Density Of Solid: | 5727 |
| Molar Volume: | 12.95 |
| Youngs Modulus: | 8 |
| Bulk Modulus: | 22 |
| Mineral Hardness: | 3.5 |
| Brinell Hardness: | 1440 |
| Electrical Resistivity: | 30 |
| Refractive Index: | 1.001552 |
| Melting Point: | 817 |
| Boiling Point: | 614 |
| Critical Temperature: | 1427 |
| Thermal Conductivity: | 50 |
| Enthalpy Of Fusion: | 27.7 |
| Enthalpy Of Vaporization: | 32.4 (sublimation) |
| Enthalpy Of Atmization: | 302 |
| Most Common Oxidation Numbers: | 5,3,-3 |
| Color: | Metallic grey |
| Classification: | Semi-metallic |
| Discovered By: | Known since ancient times |
| Discovered At: | not known |
| Origin Of Name: | From the Greek word arsenikon meaning yellow orpiment |
Calculate the molecular weight of Arsenic or molecular weight As.
Also see the full list of chemical elements and atomic weights.