Arrange the following elements in decreasing order of their atomic radius.
Be, Ca, Mg, Ba, Ra, Sr

Be > Mg > Sr > Ca > Ra > Ba

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Ba > Ra > Sr > Mg > Ca > Be

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Ra > Ba > Sr > Ca > Mg > Be

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Be > Mg > Ca > Sr > Ba > Ra

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Solution

The correct option is B Ra > Ba > Sr > Ca > Mg > Be
On moving down the group atomic radius increases, therefore the decreasing order comes out to be Ra > Ba > Sr > Ca > Mg > Be.

Hence, the correct option is $C$

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