Answer:
Hydrogen occupies a
unique position in the modern periodic table due to the following reasons
(i) Both hydrogen
and alkali metals have similar outer electronic configuration as both have one
electron in the valence shell. Therefore, some of the properties of hydrogen are
similar to those of alkali metals and hence, it can be placed in group along with
alkali metals.
(ii) Both
hydrogen and halogens have similar outer electronic configuration (both have
one electron less than the nearest inert gas configuration). Therefore, some of
the properties of hydrogen are similar to those of halogens and hence, it can
be placed in group 17 along with halogens.
(iii) In
some properties, it differs from both hydrogen and halogens, e.g., the oxide of
hydrogen, i.e., H2O is neutral but the oxides of alkali metals
(i.e., Na2O, K2O etc.) are basic while those of halogens
(i.e., Cl2O7, Br2O5, I2O5
etc.) are acidic.
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