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The starting element and last element in the largest period in modern periodic table are

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An Intiative by Sri Chaitanya

Rb and Xe

Cs and I

Cs and Rn

Fr and Kr

answer is B.

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Detailed Solution

The 6th period is the largest period in the modern periodic table as it contains 32 elements.

But if you are looking for total information 7th period is also the largest period along with the 6th, as of today all 32 elements of the 7th period are discovered and recognized by IUPAC.

Therefore, Option B is the correct answer

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