Question

why are first group elements called alkali metals​

Answer 1

The group 1 of the periodic table contain six elements namely Lithium(Li), Sodium(Na),Potassium(K),Rubidium(Rb),Cesium(Cs) and Francium(Fr). These metals are called alkali metals because they form alkalies( i.e. strong bases capable of neutralizing acids) when they react with water.

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Answer 2

Explanation:

because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids).