Answer:
Although hydrogen is placed at the
top of the alkali metal family of group 1, its position is not fully justified.
While all the elements in group 1 are typical metals, hydrogen is a non-metal.
Moreover, the same criteria is not used in case of helium(Z = 2). On the basis
of electronic configuration (1s2), it should have been placed at the
top of alkaline earth metals (group2) but it finds a place at the top of noble
gases (group 18) as it resembles them in characteristics. In case hydrogen is placed
separately in the periodic table, it would have been the best.
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