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Atomic mass, symbol and atomic number
argon is a naturally occurring element with the elementary symbol Ar and the atomic number 18. In the periodic table it stands with an atomic mass of 39,948 u in the 8th main group. The chemical element discovered by William Ramsay in 1895 is not radioactive and is in a gaseous state at room temperature.
Characteristics: argon
| General | |
|---|---|
| Chemical element: | argon |
| Symbol: | Ar |
| Atomic number: | 18 |
| Group: | Noble gas group |
| Period: | 3 |
| Block: | p-block |
| Series: | noble gases |
| Appearance: | colorless |
| explorers: | William Ramsay |
| Year of discovery: | 1895 |
| Atomic properties | |
| Atomic mass: | 39,948 u |
| Atomic radius: | ??? pm |
| Covalent radius: | 106 pm |
| Van der Waals radius: | 188 pm |
| Electron configuration: | Ne 3s2 3p6 |
| ionization: | 1520.8 kJ / mol |
| Physical Properties | |
| Physical state: | gaseous |
| Density: | ??? |
| Crystal structure: | cubic |
| Magnetism: | diamagnetic |
| molar volume: | 22,56 · 10-6 m3/ mol |
| Mohs hardness: | / |
| Melting point: | -189 ° C |
| Boiling point: | -186 ° C |
| Heat of fusion: | 1.18 kJ / mol |
| Heat of vaporization: | 6.52 kJ / mol |
| Thermal conductivity: | 0.017 W |
| Chemical properties | |
| electronegativity: | unknown |
Did you know that ...
- Bulbs contain a mixture of nitrogen and argon?
- the earth's atmosphere consists of about 1% argon?
- the name "argon" can be derived from the Greek (= "lazy") and alludes to the low-reaction properties of argon?
- Argon is a colorless gas?
