11
Sodium
Atomic Number11
Atomic Mass22.990 u
CategoryAlkali Metal
State at Room TempSolid
Year Discovered1807
About Sodium
Highly reactive metal that explodes in water. Combined with chlorine it forms table salt, one of the most important compounds in history. Essential for nerve function and fluid balance in the body. Sodium vapor lamps produce the yellow glow of streetlights. The D-line of sodium was used to define the first standard of time.
More Alkali Metals
3
Lithium
The lightest metal and least dense solid element. Crucial for rechargeable batte...
19
Potassium
Essential for heart function, muscle contraction, and nerve signals. Reacts viol...
37
Rubidium
Discovered by its dark red spectral lines, the name means dark red. Extremely re...
55
Cesium
The international definition of a second is based on the cesium-133 atom. Most r...