Francium (Fr)
Francium
Francium (Fr) is an alkali metal in period 7, group 1. Its relative atomic mass is [223] and the molar mass of the atom is [223] g/mol.
Atomic number 87
Atomic mass [223] predicted
Molar mass [223] g/mol
Category Alkali metal Solid
Properties of francium
| Atomic number | 87 |
|---|---|
| Symbol | Fr |
| Latin name | Francium |
| Relative atomic mass | [223] |
| Molar mass | [223] g/mol |
| Group, period, block | 1, 7, s |
| Category | Alkali metal |
| State at 20 °C | Solid |
| Electron configuration | [Rn] 7s¹ |
| Electronegativity (Pauling) | 0.7 |
Electron configuration of francium
Electrons per shell
K2L8M18N32O18P8Q1
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁶ 7s¹
Noble-gas notation
87 protons · 87 electrons[Rn] 7s¹
Formula and compounds of francium
Simple substanceFrfranciumMolar mass of Fr: [223] g/mol
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Frequently asked questions
The relative atomic mass of francium is [223], so the molar mass of the atom is [223] g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁶ 7s¹. Noble-gas notation: [Rn] 7s¹.