Question

An atom of an element has one electron in the outermost shell then find the electronic configuration, no of protons and valency

Answer 1

All the elements in Group1 as one electron in the outermost shell
ex : H , li , Na , k , francium , caesumiun

Now take sodium as example.

Na
electronic configuration ― 2,8,1

No of protons ― 11.

valency -1

Answer 2

all 1 it is hydrogen........................................