Difference between revisions of "Alkali metal"
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An '''alkali metal''' is one of a group of [[element]]s in the [[periodic table]]. It is in the first column of the periodic table. The alkali metals are all very soft. All of them can be sliced with a knife. All of them are light. [[Lithium]], the first one, is only half the weight of water. All of them are very reactive. They get more reactive toward the bottom of the column. Lithium ican be found in [[lithium battery|lithium batteries]]. All of the other alkali metals are not common in household items. | An '''alkali metal''' is one of a group of [[element]]s in the [[periodic table]]. It is in the first column of the periodic table. The alkali metals are all very soft. All of them can be sliced with a knife. All of them are light. [[Lithium]], the first one, is only half the weight of water. All of them are very reactive. They get more reactive toward the bottom of the column. Lithium ican be found in [[lithium battery|lithium batteries]]. All of the other alkali metals are not common in household items. | ||
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| + | Sodium and potassium [[chemical compound|compounds]] are needed in the human body, while lithium is a little toxic. | ||
[[Category:Elements]] | [[Category:Elements]] | ||
Revision as of 20:25, November 16, 2010
An alkali metal is one of a group of elements in the periodic table. It is in the first column of the periodic table. The alkali metals are all very soft. All of them can be sliced with a knife. All of them are light. Lithium, the first one, is only half the weight of water. All of them are very reactive. They get more reactive toward the bottom of the column. Lithium ican be found in lithium batteries. All of the other alkali metals are not common in household items.
Sodium and potassium compounds are needed in the human body, while lithium is a little toxic.