When the atom Li, Be, B and Na are arranged in order of increasing atomic radius, what is the correct order ?
A
B, Be, Li, Na
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B
Li, Be, B Na
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C
Be, Li, B, Na
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D
Be, B, Li, Na
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Solution
The correct option is C B, Be, Li, Na 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.