Argon
Definition and meaning of Argon in chemistry.
Argon is a noble gas (Ar, atomic number 18) that constitutes about 0.93% of Earth's atmosphere. It is colorless, odorless, and chemically inert, making it unreactive under normal conditions.
In more detail
Argon's complete valence shell of 8 electrons gives it exceptional thermodynamic stability, preventing it from forming chemical compounds under normal atmospheric conditions. This chemical inertness makes it invaluable for applications requiring a protective, non-reactive atmosphere. Argon is extracted commercially from the atmosphere through fractional distillation of liquid air, a process where nitrogen and oxygen are selectively removed at different temperatures. Its widespread applications include welding, lighting, scientific research, and food preservation, reflecting its importance across multiple industries.
Key facts
| Chemical Symbol | Ar |
|---|---|
| Atomic Number | 18 |
| Atmospheric Abundance | ~0.93% |
| Field | Inorganic Chemistry |
Argon gas fills incandescent light bulbs to create an inert environment that prevents tungsten filaments from oxidizing, thereby extending the bulb's operational lifespan.
Frequently asked questions
Why is argon so unreactive?
Argon possesses a complete outer electron shell with 8 electrons, fulfilling the octet rule and making it thermodynamically stable.
How is argon extracted from the atmosphere?
Argon is separated from air through fractional distillation of liquid air, where nitrogen and oxygen are removed at different boiling temperatures.