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Alkali Metals and Alkaline Earth Metals. By Chris Brown & Sonja Dahl. Alkali Metals. They are the most reactive metals. In nature, they are not found by themselves, but they can be combined with nonmetals as alkali salts.
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Alkali Metals and Alkaline Earth Metals By Chris Brown & Sonja Dahl
Alkali Metals • They are the most reactive metals. • In nature, they are not found by themselves, but they can be combined with nonmetals as alkali salts. • They are stored under oil to keep the metals from reacting with O and moisture in the air. • Properties: • Low density • Low melting points • High electrical conductivity
Alkaline Earth Metals • They are less reactive than alkali metals, but they still react with water to produce H. • They are always combined in nature. Mg and Ca ions are found in seawater, and Ca is found in shells, which are made up of CaCO3.
More on alkaline earth metals • Properties: • They are harder than alkali metals. • They have a gray-white luster, but when they’re exposed to air, they form a tough, thin oxide coating. • Alloys with them generally have low densities. • Uses • Mg is used in asbestos, which was a common insulator until people discovered that it caused cancer. • Ca is in slaked lime, which is used in plaster and mortar.
