why sodium is known as alkali metal（関連順）

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Why Sodium(Na) and Potssium(K) is called alkali metals ?

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Alkali Metals - 25 Reaction of sodium and sulphur

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Alkali Metals - 22 Reaction between sodium and chlorine

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Properties of the Alkali Metals

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Why is Cesium the most reactive alkali metal?

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結果 : why sodium is known as alkali metal