| Symbol: | Na |
| Atomic Number: | 11 |
| Atomic Weight: | 22.99 |
| Density: | 0.97 g/cm3 |
| Melting Point: |
371K
98°C 208°F |
| Boiling Point: |
1156K
883°C 1621°F |
Sodium (Na) is a metallic chemical element with atomic number 11. Its only stable isotope is 23Na, 11 protons and 12 neutrons.
Sodium belongs to a group of elements called Alkali Metals, together with lithium, potassium, rubidium, caesium and francium. Just like all the other alkali metals, sodium is highly reactive.
The reason sodium has the symbol Na is that it's called Natrium in Latin.Sodium is part of many chemical compounds used daily, such as salt (NaCl) and baking soda (NaHCO3).