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When the atoms Li, Be, B and Na are arranged in order of increasing atomic radius, what is the correct order?

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B, Be, Li, Na

Li, Be, B, Na

Be, Li, B, Na

Be, B, Li, Na

answer is A.

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Detailed Solution

Moving from left to right along a period leads to decrease in size of atomic radius. Moving down a group from top to bottom leads to increase in size. Among the given species, Na is the largest. Using the reasoning from above, we have,
B<Be<Li<Na.

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