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Answer: Because hydrogen has the same ns1 electron configuration as the alkali metals, hydrogen is classified as a non-metal and is positioned above group in the periodic chart. It differs from the other alkali metals in that it creates cations (H+) more reluctantly than the others. The ionisation energy of hydrogen is 1312 kJ/mol, while that of lithium (the alkali metal with the highest ionisation energy) is 520 kJ/mol.
Hydrogen is occasionally put above the halogens in the periodic table since it is a non-metal and creates H– (hydride anions). Hydrogen, like halogens, can also create H2 dihydrogen. Hydrogen, on the other hand, is not the same as the halogens. The electron affinity of hydrogen is substantially lower than that of the halogens.
