what is argon
Argon is a chemical element (symbol Ar, atomic number 18) that is a colorless, odorless, inert gas making up about 0.93–0.94% of Earth’s atmosphere.
Quick Scoop: What Is Argon?
- Argon is a noble gas in group 18 of the periodic table, meaning it is very unreactive chemically.
- It is colorless, odorless, tasteless, nonflammable, and generally non‑toxic in normal concentrations.
- In Earth’s atmosphere, it is the third most abundant gas after nitrogen and oxygen, at about 0.934% by volume.
- The name “argon” comes from a Greek word meaning “lazy” or “inactive” because it barely reacts with other elements.
Where You Meet Argon In Real Life
- Used as an inert shielding gas in welding and high‑temperature industrial processes to protect hot metals from reacting with air.
- Fills many incandescent and fluorescent light bulbs and other gas‑discharge tubes to prevent the hot filament from burning out quickly.
- Found in some specialized lasers that produce a blue‑green light (argon gas lasers).
- Produced industrially by fractional distillation of liquid air (separating the gases in cooled liquid air).
Basic Properties At A Glance
| Property | Argon Fact |
|---|---|
| Element type | Noble gas, non‑metal. |
| Symbol / atomic number | Ar, 18. |
| Appearance | Colorless, odorless gas. |
| Reactivity | Very inert; almost no normal chemical reactions. |
| Atmospheric share | About 0.93–0.94% of Earth’s atmosphere by volume. |
| State at room temp | Gas. |
| Discovery | Isolated from air in 1894 by Lord Rayleigh and Sir William Ramsay. |
Tiny Origin Story
In the late 1800s, scientists noticed that the density of air didn’t quite match what they expected from nitrogen and oxygen alone, hinting at a hidden component. By carefully removing known gases from air, Lord Rayleigh and Sir William Ramsay isolated a new, completely unreactive gas—argon—and confirmed it as a new element in 1894.
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