Sodium notes

Sodium has atomic number 11 and the symbol Na.

A sodium atom consists out of 11 electrons, 11 protons and 12 neutrons.

Sodium is a soft, silver-white, highly reactive metal.
And sodium is an alkali metal.

Natrium's melting point is 97.794 degree celcius.
And natrium's boiling point is 882.940 degrees celcius.

Natrium has a single electron in its outer shell
that it readily donates which creates a positively charged ion the Na+ cation.

Twenty isotopes of sodium are known, but only 23Na is stable

The free metal does not occur in nature, but must be prepared from compounds.

Sodium at standard temperatures and pressures
is a metal that combines with oxygen in air and forms
grayish white sodium oxide unless immersed in oil or inert gas.

Sodium is a good conductor of electricity and heat.

Sodium ions are the major cation in the extracellular fluid.

In a flame, sodium and its compounds glow yellow.

Sodium compound uses 1:
 Table salt (NaCl)
 Baking soda (NaHCO3)

Sodium compound uses 2:
 Soda ash (Na2CO3)

Sodium compound uses 3:
 Sodium nitrate (NaNO3)

Sodium compound uses 4:
 Caustic soda (NaOH)

Sodium compound uses 5:
 For producing glass
 For producing paper
 For producing soap
 And for producing textiles

Sodium uses 1:
 For making sodium vapor lamps

Sodium uses 2:
 Liquid sodium is used as a heat transfer fluid in some types of
 nuclear reactors. Because it has high thermal conductivity and
 low neutron absorption cross section required to achieve a
 high neutron flux in the reactor.

Safety:
 Sodium forms flammable hydrogen and caustic sodium hydroxide on contact with water.
 And it can cause severe burns.
 Special fire extinguishers are needed to put out sodium fires.