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To which group and period should hydrogen be assigned ?

The position of H in periodic table has been debated since a long time,normally it is placed in group 1 and is considered an s-block element but it is also, placed in group 17

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It cannot be said particularly about the position of hydrogen in the periodic table. Hydrogen has the valency of 1 so it can be placed in group 1 but it is also a halogen therefore it can be placed in 17th group also. With regard to period, it should be placed in the first period as the no. of shells in electronic configuration of hydrogen is 1.

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