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A soft, silvery-white, very light metal which reacts explosively with water and which rapidly tarnishes in air.
 Chunks under oil Chunks under oil.
This ampoule is filled with pieces of sodium that were freshly cut under mineral oil to prevent oxidation. The space at the top is filled with argon gas to exclude oxygen. Hopefully they will remain reasonably shiny for a long time to come.
Source: Fisher Scientific
Size: pieces 0.5"
Purity: 99.9%
 Rock salt Rock salt.
It is one of the wonders of chemistry that two of the most reactive and dangerous elements (the explosive metal sodium and the choking gas chlorine) can be combined together to produce one of the safest and most innocuous substances: common salt!
Source: Water softener
Size: crystals 1/8"
Purity: 99.9%