Answer:
Be = 111, C = 77, O = 66, B = 88, N = 74
All the five elements belong to
the same period (second period). The atomic radii in a period decrease as the
effective nuclear charge increases.
\[\underset{111}{\mathop{Be}}\,>\underset{88}{\mathop{B}}\,>\underset{77}{\mathop{C}}\,>\underset{74}{\mathop{N}}\,>\underset{66}{\mathop{O}}\,\]
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