Elements belonging to the same group have similar chemical properties because:

they are all metallic elements

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they have similar electronic configuration

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atomic number increases on moving down the group

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none of these

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Solution

The correct option is A they have similar electronic configuration
Outermost valence electronic configuration of elements are same in a group, hence possess similar properties.

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Similar questions

Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

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