Er
Erbium Symbol (Er)
Erbium is element 68 of the periodic table. Copy its symbol Er and see its atomic weight, electron configuration and physical properties.
What does Er mean?
Er is the chemical symbol for erbium, element number 68 in the periodic table. Erbium is a lanthanide in the f-block, period 6. It is a solid at room temperature and was discovered in 1843.
Codes and properties
| Chemical symbol | Er |
|---|---|
| Atomic number (Z) | 68 |
| Atomic weight (PubChem) | 167.26 |
| Group / period | f-block / 6 |
| Element category | lanthanide |
| Electron configuration | [Xe]6s² 4f¹² |
| State at 20 °C | Solid |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.24 |
| Melting point | 1802 K (1528.85 °C) |
| Boiling point | 3141 K (2867.85 °C) |
| Density | 9.07 g/cm³ |
| Discovered | 1843 |
How to type Er
- Plain text: type
Er— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as H₂O — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Er}in math mode, or use the mhchem package:\ce{Er}. - HTML:
Er; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for erbium?
The chemical symbol for erbium is Er.
What is the atomic number of erbium?
Erbium has atomic number 68, meaning each atom has 68 protons.
What is the electron configuration of erbium?
The ground-state electron configuration of erbium is [Xe]6s² 4f¹².
Related symbols
Keep exploring
Reference: Erbium on PubChem (NIH)