Na
Sodium
Sodium is a chemical element with the symbol Na and atomic number 11. It has a standard atomic weight of 22.99, sits in period 3 and group 1, and is classified as an alkali metal.
Properties
| Symbol | Na |
|---|---|
| Atomic number | 11 |
| Standard atomic weight | 22.99 |
| Category | Alkali metal |
| Group | 1 |
| Period | 3 |
| Electron configuration | [Ne] 3s1 |
| Outer-shell electrons | 1 |
The figure of 22.99 is a standard atomic weight.
Compounds containing sodium
34 of the compounds in this reference contain Na, listed by the fraction of their mass it makes up.
| Compound | Formula | Atoms | % by mass |
|---|---|---|---|
| sodium borohydride | BH4Na | 1 | 60.8% |
| sodium peroxide | Na2O2 | 2 | 59.0% |
| sodium amide | H2NNa | 1 | 58.9% |
| sodium hydroxide | HNaO | 1 | 57.5% |
| sodium fluoride | FNa | 1 | 54.8% |
| sodium cyanide | CNNa | 1 | 46.9% |
| sodium carbonate | CNa2O3 | 2 | 43.4% |
| washing soda | CNa2O3 | 2 | 43.4% |
| sodium chloride | ClNa | 1 | 39.3% |
| sodium metasilicate | Na2O3Si | 2 | 37.7% |
| sodium silicate | Na2O3Si | 2 | 37.7% |
| sodium sulfite | Na2O3S | 2 | 36.5% |
| sodium azide | N3Na | 1 | 35.4% |
| sodium nitrite | NNaO2 | 1 | 33.3% |
| sodium sulfate | Na2O4S | 2 | 32.4% |
| sodium hypochlorite | ClNaO | 1 | 30.9% |
| sodium thiosulfate | Na2O3S2 | 2 | 29.1% |
| sodium acetate | C2H3NaO2 | 1 | 28.0% |
| baking soda | CHNaO3 | 1 | 27.4% |
| sodium bicarbonate | CHNaO3 | 1 | 27.4% |
| sodium nitrate | NNaO3 | 1 | 27.0% |
| sodium bromide | BrNa | 1 | 22.3% |
| sodium molybdate | MoNa2O4 | 2 | 22.3% |
| sodium chlorate | ClNaO3 | 1 | 21.6% |
| sodium phosphate | NaO4P | 1 | 19.5% |
Showing the 25 with the highest Na content, of 34.
Calculate with sodium
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 1
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.