Why do the elements in the same group have similar chemical properties?

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Solution

According to Modern periodic law, the physical and chemical properties of an element depend on the number of electrons in the valence shell of the atom.
In a group, all the elements have the same number of valence electrons.
So, we can say that elements in the same groups have similar chemical properties.

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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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