Hydrogen should be placed in which group and which period? Give reasons.
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Similar to alkali metals it has one electron in it valence shell.
Similar to alkali metals it loses one electron to form cation.
Similar to alkali metals it combines with Oxygen, Sulphur and Halogens to form similar compounds.
Similar to halogens, hydrogen exists as a diatomic molecule and combines with metals and non metals to form covalent compounds.
Because of the above reasons their is uncertainity regarding the position of hydrogen.
due to the above uncertainty Hydrogen occupies a different position and has it's own class.
it is placed in 1st group because it has only one electron in its orbital.