11Na22.99
Sodium
Alkali metal · element 11 · group 1, period 3
Quick facts
| Symbol | Na |
|---|---|
| Atomic number | 11 |
| Relative atomic mass | 22.99 |
| Category | Alkali metal |
| Position | group 1, period 3 |
| State at 20 °C | Solid |
| Melting point | 97.8 °C |
| Boiling point | 882.9 °C |
| Density | 0.968 g/cm³ |
| Electronegativity | 0.93 |
| Electron configuration | [Ne] 3s1 |
About Sodium
Sodium has the symbol Na and atomic number 11, which means every sodium atom has 11 protons in its nucleus and, in a neutral atom, 11 electrons. At room temperature it is a solid.
Alkali metals are soft, shiny metals in group 1. They react quickly with water to make an alkaline solution and hydrogen gas, and they get more reactive going down the group.
It melts at 97.8 °C and boils at 882.9 °C.
Explore it
See where sodium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.