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All the members of group 1 are metals. Li and Na react with water rapidly whereas k,Rb and Vs react vigorously. write electronic configuration of Li and K

and find their valence.from the given information,infer the change in reactivity in a group given.


Li electronic cofigration 1s2 2s1 Na 1s2 2s2 2p6 3s1 Valency 1 Li and Na don't have d orbitals so they react vigoursly
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Li-2,1 valency is 1.
K-2,8,8,1 Valency is 1.

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