- Chemistry. a soft, silver-white, metallic element that oxidizes rapidly in moist air, occurring in nature only in the combined state, and used in the synthesis of sodium peroxide, sodium cyanide, and tetraethyllead: a necessary element in the body for the maintenance of normal fluid balance and other physiological functions. Symbol: Na; atomic weight: 22.9898; atomic number: 11; specific gravity: 0.97 at 20°C.
- Medicine/Medical, Pharmacology. any salt of sodium, as sodium chloride or sodium bicarbonate, present in or added to foods or beverages as a seasoning or preservative and used in many pharmaceutical products as an antacid, anticoagulant, or other agent.
Origin of sodium
Examples from the Web for sodium
For example, Kuwait recently put a limit the allowable amount of sodium in bread to lower blood pressure.The Secret to Tracking Ebola, MERS, and Flu? Sewers
November 29, 2014
For all intents and purposes, sodium thiopental is now unavailable in the United States.Pennsylvania’s Lethal Injection Fiasco
September 18, 2014
Sports drinksSugar and sodium are good things when it comes to sports drinks!10 Ways to Stay Hydrated (That Aren’t Water)
July 25, 2014
Other measurements on nutrition labels—calories, fat, sodium—are passive: They simply state how much is in the food.Guess Who Doesn’t Want You to Know How Much Added Sugar Is in Your Food
July 19, 2014
Salt (or, more specifically, sodium) excess goes by the medical term “hypernatremia.”When Table Salt Becomes Poison
June 20, 2014
Oxygen will combine with iron or lead or sodium, but cannot be made to combine with fluorine.The Machinery of the Universe
Amos Emerson Dolbear
You cannot do this experiment, however, as the sodium does its work so violently that it is dangerous.Common Science
Carleton W. Washburne
For the saponification we employ a solution of sodium ethylate in the cold.Researches on Cellulose
C. F. Cross
So it was a conversion of sodium chloride into sodium nitrate.Priestley in America
Edgar F. Smith
It is a gray metal, considerably heavier and harder than sodium.An Elementary Study of Chemistry
- a very reactive soft silvery-white element of the alkali metal group occurring principally in common salt, Chile saltpetre, and cryolite. Sodium and potassium ions maintain the essential electrolytic balance in living cells. It is used in the production of chemicals, in metallurgy, and, alloyed with potassium, as a cooling medium in nuclear reactors. Symbol: Na; atomic no: 11; atomic wt: 22.989768; valency: 1; relative density: 0.971; melting pt: 97.81±0.03°C; boiling pt: 892.9°C
- (as modifier)sodium light
Word Origin and History for sodium
metallic alkaline element, 1807, coined by English chemist Humphry Davy from soda; so called because the element was isolated from caustic soda (sodium hydroxide). The chemical symbol Na is from natrium, alternative name for the element proposed by Berzelius from natron, a name of a type of soda.
- A soft, light, highly reactive metallic element that is naturally abundant, especially in common salt. Atomic number 11.
- A soft, lightweight, silvery-white metallic element of the alkali group that reacts explosively with water. It is the most abundant alkali metal on Earth, occurring especially in common salt. Sodium is very malleable, and its compounds have many important uses in industry. Atomic number 11; atomic weight 22.99; melting point 97.8°C; boiling point 892°C; specific gravity 0.971; valence 1. See Periodic Table.