Erbium (Er) — Lanthanide. Atomic number 68.
Silvery-white metal
- Atomic number: 68
- Symbol: Er
- Atomic mass: 167.26 u
- Category: Lanthanide
- State: Solid
- Melting point: 1528.85 °C / 1802 K
- Boiling point: 2867.85 °C / 3141 K
- Density: 9.07 g/cm³ (20°C)
- Electron configuration: [Xe] 4f12 6s2
- Oxidation states: +3
- Electronegativity: 1.24
- Discovered by: Carl Gustav Mosander (1843)
Common uses: Fiber-optic amplifiers, Lasers, Glass coloring
Biological role: No known biological role.
Frequently Asked Questions about Erbium
What is the atomic number of erbium?
Erbium has an atomic number of 68, meaning each atom contains 68 protons in its nucleus.
What is the atomic mass of erbium?
The standard atomic weight of erbium is 167.26 u (unified atomic mass units).
What category does erbium belong to?
Erbium is classified as a lanthanide.
What is the state of erbium at room temperature?
Erbium is a solid at 20 °C (68 °F).
What is the melting point of erbium?
The melting point of erbium is 1528.85 °C / 1802 K.
What is the boiling point of erbium?
The boiling point of erbium is 2867.85 °C / 3141 K.
What is the density of erbium?
The density of erbium is 9.07 g/cm³ (20°C).
What is the electronegativity of erbium?
Erbium has a Pauling electronegativity of 1.24.
What is the electron configuration of erbium?
The electron configuration of erbium is [Xe] 4f12 6s2.
What are the common oxidation states of erbium?
Erbium commonly exhibits the following oxidation states: +3.
When was erbium discovered?
Erbium was discovered in 1843 by Carl Gustav Mosander.
Is erbium radioactive?
Erbium is a stable element with no naturally occurring radioactive isotopes.
What is the biological role of erbium?
No known biological role.
What are the common uses of erbium?
Erbium is used for: Fiber-optic amplifiers; Lasers; Glass coloring.
