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Atomic mass, symbol and atomic number
aluminum is a naturally occurring element with the element symbol Al and the atomic number 13. In the periodic table it stands with an atomic mass of 26.981 u in the 3rd main group. The chemical element discovered by Humphry Davy in 1808 is not radioactive and is in a solid state at room temperature.
Profile: Aluminum (English)
| General | |
|---|---|
| Chemical element: | aluminum |
| Symbol: | al |
| Atomic number: | 13 |
| Group: | boron group |
| Period: | 3 |
| Block: | p-block |
| Series: | metals |
| Appearance: | silver |
| explorers: | Humphry Davy |
| Year of discovery: | 1808 |
| Atomic properties | |
| Atomic mass: | 26,981 u |
| Atomic radius: | 125 pm |
| Covalent radius: | 121 pm |
| Van der Waals radius: | 184 pm |
| Electron configuration: | Ne 3s2 3p1 |
| ionization: | 577.5 kJ / mol |
| Physical Properties | |
| Physical state: | firmly |
| Density: | 2.7 g / cm3 |
| Crystal structure: | cubic |
| Magnetism: | paramagnetic |
| molar volume: | 10,00 · 10-6 m3/ mol |
| Mohs hardness: | 2,75 |
| Melting point: | 660 ° C |
| Boiling point: | 2470 ° C |
| Heat of fusion: | 10.7 kJ / mol |
| Heat of vaporization: | 284 kJ / mol |
| Thermal conductivity: | 235 W |
| Chemical properties | |
| electronegativity: | 1,61 |
Did you know that ...
- Aluminum is the third most common element of the Earth's crust and the most common metal?
- China is the largest producer of aluminum worldwide?
- Aluminum is often used as a component of circuit boards because of its good electrical conductivity?
- Aluminum with gold is one of the most flexible metals?
