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Which of the following is correct for periods?

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Last element of $2^{nd}$ period $\to$ Ne

Last element of $3^{rd}$ period $\to$ Ar

Last element of $4^{th}$ period $\to$ Kr

All are correct

answer is D.

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Detailed Solution

2 nd period starts from Li -ends with Ne

3rd period starts from Na - ends with Ar

4Th period starts from K - ends with Kr

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