What is the atomic radius of sodium?

The empirical atomic radius of sodium is 180 picometers. The calculated atomic radius is 190 picometers. One picometer is 10 to12 meters. The amounts are somewhat different because one is based on observation and the other is based on calculation.

Sodium is a silvery, highly reactive metal whose atomic number is 11. Its symbol, Na, derives from the Latin word natrium.

Because sodium is so reactive, it is rarely found in its free state but readily forms compounds with other elements. One of the most important is the compound it forms with chlorine, a reactive halogen. This compound is NaCl, or table salt.