Question

what similarity do you find in their electronic configuration?
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Answer 1

Answer:

From the above electronic configurations, we can say that the number of valence electrons of all the elements are same which is 1. Valence electrons are defined as the number of electrons which are present in the outermost shell.

Answer 2

Answer:

From the above electronic configurations, we can say that the number of valence electrons of all the elements are same which is 1. Valence electrons are defined as the number of electrons which are present in the outermost shell.