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2014-12-29T09:16:45+05:30

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Position of hydrogen was not justified with alkali metals in the periodic table because of following differences in properties from the alkali metal:
1. H is a non-metal whereas alkali metals are metals.
2. At room temperature, H is a gas whereas alkali metals are solids.
3. H forms both ionic and covalent bond whereas alkali metals form only ionic           bonds.
4. H requires very high energy for ionisation compared to the alkali metals.
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2014-12-29T09:37:24+05:30

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Hydrogen was placed in group 1 but it resembled properties of both group 1 alkali metals and group 7 halogens.
Hydrogen has its electronic configuration as 1s^1.
Both group 1 and group 7 elements also have same configuration in there outer most shell.
So there is a great confusion in the position of hydrogen.
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hydrogen resembles alkali metals as well as halogens that's why, no fixed position could be given to hydrogen in the periodic table