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    $\begingroup$ Well, hydrogen was sometimes also put over chlorine in the Table. In this context it could be appropriate. $\endgroup$
    – Mithoron
    Commented Mar 12, 2023 at 18:24
  • $\begingroup$ The chemical elements of the same group have similar properties except H , H doesnt have the properties of alkali metals so a H+ added to a OH- (hydroxide anion) doesnt have any reason to be similar to the addition of a alkali metal to a OH-. $\endgroup$
    – Volpina
    Commented Mar 12, 2023 at 18:44
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    $\begingroup$ Notice the ionisation energies of H 1312 kJ/mol , Li 520 kJ/mol, Na 496 kJ/mol ( see en.wikipedia.org/wiki/Molar_ionization_energies_of_the_elements ) $\endgroup$
    – Poutnik
    Commented Mar 12, 2023 at 18:48
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    $\begingroup$ chemistry.stackexchange.com/questions/129008/… $\endgroup$
    – Mithoron
    Commented Mar 12, 2023 at 18:52
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    $\begingroup$ So basically you are asking why H and Li are more different than He and Ne, right? H and He are the only period 1 elements, so there is little you can compare them to otherwise. You can describe hydrogen atoms as having one electron in the outer shell (like other group 1), as having a half-filled outer shell (like carbon and the rest of group 14) or being one electron away from a filled shell (like fluorine and the rest of group 17). Also, hydrogen is considered a non-metal and lithium is a no-doubt-about-it metal. Other groups have non-metals and metals, but with metalloids in between. $\endgroup$
    – Karsten ♦
    Commented Mar 12, 2023 at 22:53