Question

Difference of hydrogen with alkali metals and halogens

Answer 1

In Mendeleev's periodic, the elements are arranges in the order of their increasing atomic masses, its place in Mendeleev periodic table is not fixed. Hydrogen is placed in group 1 and group 17 as it resembles alkali metals and halogens.

In modern periodic table, the elements are arranged in their increasing order of their atomic number. Therfore, the atomic number of hydrogen is 1 by which he can donate the electron and form stable action (H+) but hydrogen does not able to stable anion (H-).Hence, hydrogen is placed in group 1 rather being in group 17 in modern periodic table.

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Answer 2

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Difference of hydrogen with alkali metals and halogens were given below :

• Hydrogen has no lone pair.
• Hydrogen oxide (H₂O) is ampoteric, halogen is acidic (Cl₂O₇).
• Hydrogen have no neutron.
• Hydrogen is less electronegative then halogens.