Hydrogen outer shell full with only two electrons, to have completely filled electronic configuration.
Hydrogen has atomic number of 2 i.e., it has total of 2 electrons. As per the rule maximum of 2 electrons can be filled in first energy shell.
In case of Hydrogen both the electrons are present in n = 1 shell, here n is principle quantum number. It has completely filled electronic configuration and also the most stable electronic configuration.
Valence electrons can be defined as the number of electrons present in the outermost shell of the atom of a chemical element.
Therefore, hydrogen would require just a single valence electron to have full outer shell and it has only one proton and one electron in its nucleus.
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