Question

there is a anomaly in the position of hydrogen because it can be placed I done in group 1 or group 17 in the first period why?​

Answer 1

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ANSWER :

Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups.

Like group I elements, hydrogen has only one electron in its valence shell. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 (alkali metals).

However, like group 17 elements, it requires only electron to complete its valence shell, thus it can also gain an electron to achieve a noble gas configuration.

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Answer 2

Answer:

Due to its electronic configurational similarities with both, halogens and alkali metals, it can be placed in either groups.

Explanation:

Hydrogen exhibits an anomaly in its properties, and thus, can be placed in Group 1 and 17 of the Periodic Table, based on the present classification principles.

This can be explained as follows -

• Hydrogen has an electronic configuration similar to both groups.

• Like the elements in Group 1, it has one electron in its valence shell. Thus, it can achieve a stable configuration by losing 1 electron.

• However, also like the elements in Group 17, it requires 1 electron to complete its valence shell. Thus, it can also gain an electron to achieve a noble gas configuration.

• It is a diatomic molecule like halogens and can form covalent bonds with non-metals.

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