Question

Write down the electronic configuration of the first three elements of group1.What similarity you will find in the electronic configurations of these elements ?

Answer 1

Answer:

hey

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•hydrogen =1 ( atomic no)

valence electron = 1

• helium= 2 ( atomic no)

electronic configuration = 2

valence electron =2

•lithium = 3 ( atomic no)

electronic configuration=2,1

valence electron = 1

in the first three groups in the first shell (k) they have maximum 1 and 2 electrons and maximum times atomic no is the electronic configuration itself

and in the valence shell they in hydrogen there is no valence electrons

hope helped

Explanation: