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प्रश्न
Justify the position of hydrogen in the periodic table?
उत्तर
Hydrogen resembles alkali metals in the following aspects.
- Electronic configuration 1s1 as alkali metals have ns1.
- Hydrogen forms unipositive H+ ion like alkali metals Na+, K+.
- Hydrogen forms halides (HX), oxides (H2O) peroxide (H2O2) like alkali metals (NaX. Na2O, Na2O2).
- Hydrogen also acts as a reducing agent like alkali metals. Hydrogen resembles halogens in the following aspects.
- Hydrogen has a tendency to gain one electron to form a hydride ion (H–) as halogens to form a halide ion. (X–).
- Comparing the properties of hydrogen with alkali metals and with halogens, we can conclude that hydrogen resembles more alkali metals. In most of the compounds, hydrogen exists in a +1 oxidation state.
- Therefore, it is reasonable to place the hydrogen in group 1 along with alkali metals as shown in the latest periodic table published by IUPAC.
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