All the members of group I are metals. L...

All the members of group I are metals. Li and Na react with water rapidly whereas K, Rb, and Cs react vigourously. Write the electronic configuration of Li and K and find their valency from the given information. Infer the change in reactivity in a group given atomic numbers of Li and K are 3 and 19 respectively.

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Electronic configuration: `Li (3) to 2, I and K (19) to 2, 8, 8, 1`. Valency of both is I since they belong to group one. Since chemical reactivity increases as we move down a group, K, Rb, and Cs which lie below Li and Na in group I are more reactive.

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