Q. 27 B4.5( 4 Votes )

On the basis of e

Class 10th Lakhmir Singh & Manjit Kaur - Chemistry 5. Periodic Classification of Elements

Answer :

(i) The elements whose valence shell electrons are same, it means that those elements have similar chemical properties.

(ii) The first element can be identified by checking its valence shell electrons, elements which have 1 electron in their valence shell then these elements are the first element of the period.

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