68 Er 167.259
Erbium
lanthanide
Properties
- Atomic number
- 68
- Atomic mass
- 167.259 u
- Category
- lanthanide
- Group
- f-block
- Period
- 6
- Block
- f-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 1.24 (Pauling)
- Density
- 9.066 g/cm³
- Melting point
- 1528.85 °C
- Boiling point
- 2867.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹²
Noble-gas shorthand: [Xe] 4f¹² 6s²
Electrons per shell: 2, 8, 18, 30, 8, 2, which is 2 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Erbium
Erbium is a chemical element in the lanthanide series, with symbol Er and atomic number 68. A silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements on Earth. As such, it is a rare earth element which is associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden, where yttrium, ytterbium, and terbium were discovered.
- Discovered by Carl Gustaf Mosander
- Appearance: silvery white
Erbium: frequently asked questions
- What is Erbium?
- Erbium (Er) is the chemical element with atomic number 68. It is a metal: specifically a lanthanide.
- What is the atomic number of Erbium?
- Erbium's atomic number is 68, which means every Erbium atom has 68 protons in its nucleus.
- What is the electron configuration of Erbium?
- The electron configuration of Erbium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f12 (noble-gas shorthand: [Xe] 4f12 6s2). Its electrons are arranged in shells of 2, 8, 18, 30, 8, 2, with 2 in the outermost shell.
- Is Erbium a metal or a nonmetal?
- Erbium is a metal: specifically a lanthanide.
- What group and period is Erbium in?
- Erbium sits in the f-block (the lanthanide row) of period 6 on the periodic table.
- Is Erbium a solid, liquid, or gas?
- At room temperature, Erbium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.