Lawrencium (Lr)
Lawrencium
Lawrencium (Lr) is an actinide in period 7. Its relative atomic mass is [266] and the molar mass of the atom is [266] g/mol.
Atomic number 103
Atomic mass [266] predicted
Molar mass [266] g/mol
Category Actinide Unknown
Properties of lawrencium
| Atomic number | 103 |
|---|---|
| Symbol | Lr |
| Latin name | Lawrencium |
| Relative atomic mass | [266] |
| Molar mass | [266] g/mol |
| Group, period, block | —, 7, f |
| Category | Actinide |
| State at 20 °C | Unknown |
| Electron configuration | [Rn] 5f¹⁴ 7s² 7p¹ |
Electron configuration of lawrencium
Electrons per shell
K2L8M18N32O32P8Q3
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 7s² 7p¹
Noble-gas notation
103 protons · 103 electrons[Rn] 5f¹⁴ 7s² 7p¹
Formula and compounds of lawrencium
Simple substanceLrlawrenciumMolar mass of Lr: [266] g/mol
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Frequently asked questions
The relative atomic mass of lawrencium is [266], so the molar mass of the atom is [266] g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 7s² 7p¹. Noble-gas notation: [Rn] 5f¹⁴ 7s² 7p¹.