Question

write down the electronic configuration of the first three elements of group 1 what similarities do you find in the electronic configuration how many valence electrons are present in these three elements

Answer 1

lithium (he) 2s1
sodium(ne)3s1
potassium (ar) 4s1
1 similarities between this configuration is all the elements contain 1 electron in its last shell
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Answer 2

I think it's s- block elements==>
H= 1s-1
Li= 1s-1,2s-2
Na=1s-1,3s-1
K=1s-1,4s-1
Rb=1s-1,5s-1