Sodium (Na)
Natrium
Sodium (Na) is an alkali metal in period 3, group 1. Its relative atomic mass is 22.99 and the molar mass of the atom is 22.99 g/mol.
Atomic number 11
Atomic mass 22.99
Molar mass 22.99 g/mol
Category Alkali metal Solid
Properties of sodium
| Atomic number | 11 |
|---|---|
| Symbol | Na |
| Latin name | Natrium |
| Relative atomic mass | 22.99 |
| Molar mass | 22.99 g/mol |
| Group, period, block | 1, 3, s |
| Category | Alkali metal |
| State at 20 °C | Solid |
| Electron configuration | [Ne] 3s¹ |
| Electronegativity (Pauling) | 0.93 |
| Atomic radius | 180 pm |
Electron configuration of sodium
Electrons per shell
K2L8M1
Full notation
1s² 2s² 2p⁶ 3s¹
Noble-gas notation
11 protons · 11 electrons[Ne] 3s¹
Formula and compounds of sodium
Simple substanceNasodiumMolar mass of Na: 22.99 g/mol
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Frequently asked questions
The relative atomic mass of sodium is 22.99, so the molar mass of the atom is 22.99 g/mol.
Full: 1s² 2s² 2p⁶ 3s¹. Noble-gas notation: [Ne] 3s¹.