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Explain the position of hydrogen in the periodic table on the basis of its electronic configuration.

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Hydrogen is the first element of the periodic table & often called protium. Its electronic configuration is $[1 s^{1}] .$ Due to the presence of only one electron in its 1s shell, hydrogen exhibits a dual behaviour, i.e., it resembles both alkali metals and halogens.
As a result it is placed at the top of the alkali metals in group 1 & also along the halogens in group 17 since just like halogens,it also requires any one electron to have the configuration of the nearest noble gas element.

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