Question

Explain the position of hydrogen in the periodic tables

Answer 1

Hydrogen is placed at the top of the first group as it reassembles the electronic configuration of first group. Both, the first group and hydrogen has 1 valence electrons in its outermost shell. But while studying the first group hydrogen is not counted as it has totally different properties from them.

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Answer 2

Hey mate,

Here's your answer

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Hydrogen is the first element in the periodic table. It's atomic number is 1, and it has only one electron in its valence shell. Therefore, it belongs to the first group and the first period of periodic table.

It is expected that the properties of hydrogen should be similar to those of the other members of the other members of Ist group, but this is not the case. Ever since Mendeleev presented his periodic table, the position of hydrogen in the table has been a matter of controversy and debate. This is mainly because some of the properties of hydrogen resemble the properties of the Group I A elements (alkali metals) while others are similar to those of the Group VII A (halogens) elements. Thompson suggested a separate position for hydrogen. He puts it at the top of the periodic table; that does not disturb the symmetry of the modern periodic table.

Note :

Hydrogen shows a dual nature since it resembles the alkali metals of Group IA and the halogens of Group VII (17).

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