Hydrogen is the first element of the periodic table as its atomic number is one, which means it has only one electron in its atom and thus only one electron is present in its outermost shell. The placement of elements in the periodic table is based on their electronic configuration.


Position of an element in periodic table depends upon its electronic configuration and properties. Hydrogen resembles the elements of group I-A, IV-A and VII-A in some respects. Properties of hydrogen do not completely match any one of the above-mentioned groups. That is why position of hydrogen is still undecided.


UNIQUE ATOMIC STRUCTURE OF HYDROGEN:
Hydrogen is the only element which has no neutron in its nucleus.
Conclusion
Due to above reasons it is clear that hydrogen cannot be placed in any one of the above mentioned groups.


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Position of Hydrogen In Periodic Table Hindi Urdu Lecture Chemistry
Position of Hydrogen In Periodic Table
Position of Hydrogen In Periodic Table chemistry lectures