Ar
Argon
Element 18 · 39.948 u
NumerasieCity name (optional, probably does not need a translation)
p-block
Periode 3
Group 18
Gas by RT
Dag lengte: →
Argon is the most abundant noble gas in Earth's atmosphere, comprising nearly 1% of the air.
Fisiese eienskappe
| Atomic Mass | 39.948 u |
| Density | 0.0017837 g/cm³ |
| Smelt punt: | 83.8 K |
| Boiling Point | 87.3 K |
| Appearance | Colorless gas |
| Toestand by kamerkomp | Gas |
Chemical Properties
| 1st Ionization Energy | 1520.6 kJ/mol |
| Electron Affinity | -96.0 kJ/mol |
| Oxidation States | 0 |
Atomic Properties
| Electron Configuration | [Ne] 3s2 3p6 |
| Atomic Radius | 71.0 pm |
| Covalent Radius | 106.0 pm |
| Atomic radius: | 188.0 pm |
Discovery
| Discovered By | Lord Rayleigh, William Ramsay |
| Discovery Year | 1894 |
| Location | London, England |
| Genoemde Na | Greek 'argon' meaning lazy or inactive |
About Argon
Argon is a colorless, odorless noble gas making up 0.934% of Earth's atmosphere. It is produced primarily by radioactive decay of potassium-40. Argon is completely inert under normal conditions and was the first noble gas to be discovered.
Gebruiks & Programme
Welding shielding gas, incandescent and fluorescent lighting, insulating gas in windows, and preservation of historic documents.
Fun Fact
Argon got its name from the Greek word for 'lazy' because it participates in virtually no chemical reactions.
Isotopes
| Definieer Molekulêr Gewigte | Abundance | Half-Life | Stabiel |
| 36 | 0.003336% | - | Ja |
| 38 | 0.000629% | - | Ja |
| 40 | 0.996035% | - | Ja |
Electron Configuration
[Ne] 3s2 3p6