Sodium's atomic number is 11. Sodium has 11 protons and 12 neutrons.
Sodium's atomic mass in AMU (atomic mass units) is 22.99.
Properties of Sodium
Sodium is a soft metal, is reactive and has a low melting point. Sodium reacts quickly with water.
Where is Sodium Found?
Sodium composes about 3 percent of the Earth's crust, but it is never found in its pure form as sodium metal. This is because of its extreme reactivity, with exposure to air, water and many other substances causing often rapid and very energetic reactions. As such, it is found naturally only in compounds with other elements, such as sodium chloride, sodium borate, sodium carbonate, and many others.
How is Sodium Used on Earth?
The three most used forms of sodium is salt, soda, and washing detergent, such as borax.
What Type of Metal is Sodium?
Sodium is an alkali metal.