Question

 On the basis of electronic configuration, how will you identify the first and the last element of a period ?




Kindly answer correctly :-\​

Answer 1

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On the basis of electronic configuration, how will you identify the first and the last element of a period?

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The element is said to be in the first element of a period if the number of valence electron is 1. If the number of valence electron is 8, the element is said to be the last element of a period.