The correct decreasing order of atomic radii (pm) of Li, Be, B and...

The correct decreasing order of atomic radii

(\mathrm{pm})

\mathrm{Li}, \mathrm{Be}, \mathrm{B}

and C is

Options

A $\mathrm{Be}\gt\mathrm{Li}\gt\mathrm{B}\gt\mathrm{C}$
B $\mathrm{Li}\gt\mathrm{Be}\gt\mathrm{B}\gt\mathrm{C}$
C $\mathrm{C}\gt$ B $\gt$ Be $\gt\mathrm{Li}$
D $\mathrm{Li}\gt\mathrm{C}\gt\mathrm{Be}\gt\mathrm{B}$

Correct answer

B. $\mathrm{Li}\gt\mathrm{Be}\gt\mathrm{B}\gt\mathrm{C}$

Step-by-step solution

As the atomic number in a period increases, the effective nuclear charge also increases hence, atomic radii along the period decreases. Correct order of atomic radii

\mathrm{Li}\gt\mathrm{Be}\gt\mathrm{B}\gt\mathrm{C}

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