ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Sodium metal. Freshly cut shiny surfaces of sodium metal. Sodium (Na) is an alkali metal. It is soft enough to be cut with a knife. It reacts rapidly with water and oxygen in the air, therefore is usually kept in oil. Sodium occurs widely in nature, principally as sodium chloride (NaCl) in sea water and salt deposits. Sodium ions are essential to life.
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