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Atomic mass, symbol and atomic number
arsenic is a naturally occurring element with the element symbol As and the ordinal number 33. In the periodic table it stands with an atomic mass of 74.921 u in the 5th main group. The chemical element discovered by Albertus Magnus 1250 is not radioactive and is in a solid state at room temperature.
Wanted: Arsenic (English: Arsenic)
| General | |
|---|---|
| Chemical element: | arsenic |
| Symbol: | ace |
| Atomic number: | 33 |
| Group: | nitrogen group |
| Period: | 4 |
| Block: | p-block |
| Series: | semimetals |
| Appearance: | metallic-silver |
| explorers: | Albertus Magnus |
| Year of discovery: | 1250 |
| Atomic properties | |
| Atomic mass: | 74,921 u |
| Atomic radius: | 115 pm |
| Covalent radius: | 119 pm |
| Van der Waals radius | 185 pm |
| Electron configuration: | Ar 3d10 4s2 4p3 |
| ionization: | 947.0 kJ / mol |
| Physical Properties | |
| Physical state: | firmly |
| Density: | ??? |
| Crystal structure: | trigonal |
| Magnetism: | diamagnetic |
| molar volume: | 22,56 · 10-6 m3/ mol |
| Mohs hardness: | 3,5 |
| Melting point: | ??? |
| Boiling point: | ??? |
| Heat of fusion: | 27.7 kJ / mol |
| Heat of vaporization: | 32.4 kJ / mol |
| Thermal conductivity: | 50 W |
| Chemical properties | |
| electronegativity: | 2,18 |
Did you know that ...
- Arsenic has been used as a poison since the Middle Ages?
- you find arsenic in the ground around the world?
- Arsenic in different colors (including yellow, black and brown) occurs?
- can be detected by the Glühröhrchenprobe arsenic?
- Arsenic as a pure element, so with only one naturally occurring isotope, applies?
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