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Sodium is a silvery-white metallic element that has many important uses. It is a soft metal, and can easily be molded or cut with a knife. Sodium belongs to a group of chemical elements that are called the alkali metals.
Strontium, STRON shee uhm, a chemical element, is a soft, silvery metal. It exists as a number of isotopes, forms of the element with the same… More>>
Beryllium, buh RIHL ee uhm, is a rare, light-gray metallic element. Beryllium never occurs in nature as a pure metal. But it is found in… More>>
Lithium, LIHTH ee uhm, is a soft, silvery-white metallic element, the lightest known metal. It is only half as heavy as an equal volume of water.… More>>
Potassium 
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