Erbium
Definition and meaning of Erbium in chemistry.
Erbium is a chemical element with the symbol Er and atomic number 68. It is a silvery-white solid metal that is part of the lanthanide series and is relatively stable in air. The element is malleable, soft, and forms uniquely characteristic pink-colored salts when combined with other elements.
In more detail
Erbium is typically found in minerals such as gadolinite, euxenite, and xenotime, often co-occurring with other heavy rare earth elements. In the periodic table, it is situated in the f-block and displays typical lanthanide chemical behavior, existing almost entirely in the +3 oxidation state. It tarnishes slowly in air, burns to form erbium(III) oxide, and reacts directly with halogens to yield colored compounds. A notable characteristic of erbium is its sharp absorption spectra in the visible light, ultraviolet, and near-infrared regions. Its ions possess optical properties that are critical for modern telecommunications, specifically their ability to emit light at a wavelength of 1.55 micrometers. This exact wavelength experiences the lowest transmission loss in standard silica-based optical fibers, making the element indispensable for long-distance data transfer.
Key facts
| Field | General Chemistry |
|---|---|
| Symbol | Er |
| Atomic number | 68 |
| Atomic mass | 167.26 u |
| Category | Lanthanide |
| State at room temperature | Solid |
| Color of salts | Pink or rose-colored |
| Year discovered | 1843 |
Erbium-doped fiber amplifiers (EDFAs) are spliced into transoceanic fiber optic cables to periodically boost the optical signal without converting it to electricity.
Frequently asked questions
Why is erbium important for the internet?
Erbium ions amplify optical signals at the exact wavelength where optical fibers are most transparent, enabling high-speed, long-distance internet traffic.
What color is erbium glass?
Erbium oxide imparts a beautiful pink color to glass and cubic zirconia, frequently used in sunglasses and cheap jewelry.