103 Lr 266
Lawrencium
actinide
Properties
- Atomic number
- 103
- Atomic mass
- 266 u
- Category
- actinide
- Group
- 3
- Period
- 7
- Block
- d-block
- State (room temp)
- Solid
- Outer-shell electrons
- 3
- Electronegativity
- 1.3 (Pauling)
- Density
- -
- Melting point
- 1626.85 °C
- Boiling point
- -
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 7p¹
Noble-gas shorthand: [Rn] 5f¹⁴ 7s² 7p¹
Electrons per shell: 2, 8, 18, 32, 32, 8, 3, which is 3 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Lawrencium
Lawrencium is a synthetic chemical element with chemical symbol Lr (formerly Lw) and atomic number 103. It is named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements. A radioactive metal, lawrencium is the eleventh transuranic element and is also the final member of the actinide series.
- Discovered by Lawrence Berkeley National Laboratory
Lawrencium: frequently asked questions
- What is Lawrencium?
- Lawrencium (Lr) is the chemical element with atomic number 103. It is a metal: specifically an actinide.
- What is the atomic number of Lawrencium?
- Lawrencium's atomic number is 103, which means every Lawrencium atom has 103 protons in its nucleus.
- What is the electron configuration of Lawrencium?
- The electron configuration of Lawrencium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 7p1 (noble-gas shorthand: [Rn] 5f14 7s2 7p1). Its electrons are arranged in shells of 2, 8, 18, 32, 32, 8, 3, with 3 in the outermost shell.
- Is Lawrencium a metal or a nonmetal?
- Lawrencium is a metal: specifically an actinide.
- What group and period is Lawrencium in?
- Lawrencium is in group 3 and period 7 of the periodic table.
- Is Lawrencium a solid, liquid, or gas?
- At room temperature, Lawrencium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.