kuala - 1/4/2005 5:06:29 AM
sodium is a metal. Thirteen isotopes of sodiuk are known. Sodium's melting point is 97.81 an dits boiling point is 882.9 degrees celsius. Sodium has one valence electron.Classification: Metallic
Thirteen isotopes of sodium are recognized
Pure sodium was first isolated by Sir Humphry Davy in 1807 through the electrolysis of caustic soda (NaOH).
Sodium is a soft, silvery-white metal which is generally stored in paraffin, as it oxidises rapidly when cut.
It is never found free in nature, due to its great reactivity.
Sodium is essential to all animals, and this has been recognised since prehistoric times. Although it is considered non-toxic, too much salt in the diet has been linked to high blood pressure under certain circumstances.
It may or may not ignite spontaneously on the water, depending on the amount of metal exposed to the water.
tarnishes within minutes of being exposed to the air,
Sodium is an essential element for all living things, including humans, although controversy surrounds the amount that we require. The sodium that comes from our food provides all we need. The average person consumes about 10 grams of salt a day although all that is needed is about 3 grams. Any excess may contribute to high blood pressure. Our bodies contain about 100 grams, and as this is continually being lost in various ways, it needs to be replaced. Sodium performs several functions within the body, such as the transmission of electrical impulses and the regulation of water content in tissue and blood.
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