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Q.

An element has n-electrons in its outermost shell, it burns when added in water and it forms a basic compound. The element is kept in kerosene.The element is

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answer is 1.

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Detailed Solution

Na and K both give the reaction, hence it must be 1s1
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An element has n-electrons in its outermost shell, it burns when added in water and it forms a basic compound. The element is kept in kerosene.The element is