Question

The number of elements in the first period is only 2 Give reason.



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Answer 1

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The number of elements in the first period is only 2 Give reason.

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The first period n=1, it is the first energy level and has only 1s orbital which can accommodate a maximum of 2 electrons hence the number of elements in the first period is only 2.

Answer 2

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●The number of elements in the first period is only 2

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$\rightsquigarrow$ In the first period n=1, it is the first energy level and it has only 1s, orbital which can accommodate with a maximum of 2 electrons So, the number of elements in the first period is only 2.