1.

what happens to the valence electrons and valency as we move to left to right in a period and top to bottom in a period?​

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Answer:

As we move LEFT to right in a period,the VALENCE electrons increases only upto GROUP 14 ,where it becomes 4 ,and then it decreases, i.e,in group 17 ,it becomes 1.

On moving down the group, the number of valence electrons, remains the same.



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