tugeva reageerimisvõimega leelismuldmetall (keem. sümbol Na, aatommass 22,99), mis (naatriumioonina) on tavaline kõikides elus rakkudes ja eriti rakuvahevedelikus
The metal is soft and silvery white. It reacts rapidly with water, oxygen, halogens. Used as a heat-transfer medium, conductor, as a reducing agent, particularly as a dispersion ... Sodium ions are essential to life, both in the diet and for functioning
