The first and last elements of the longest period are ___________.

francium and Uuo

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caesium and radon

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francium and radon

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caesium and Uuo

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Solution

The correct option is B caesium and radon
Longest period is 6th period. It contains 32 elements. It starts with Caesium. The last element is Radon.
7th period is not the longest as it contains less than 32 elements.

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