Question

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

Answer 1

According to the atomic number, we get Electronic configuration.
If we know the Atomic number of the first element and the last element we can locate it.

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Answer 2

Answer:

Explanation:

If the number of valence electron is 1 then the element is said to be the first element of a period, If the number of valence electrons are 8, the element is said to be the last element of a period