Arrange the following elements in increasing order of their size.

Be, Ca, Ba, Ra

Be < Ca < Ba < Ra

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Ca < Be < Ba < Ra

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Be < Ca < Ra < Ba

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None of these

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Solution

The correct option is A Be < Ca < Ba < Ra
Down the group, size increases due to inclusion of new shell.

Hence, the correct order will be $B e < C a < B a < R a$

Hence, the correct option is (A).

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