Q46 / 200 · NEET 2024 (Re-NEET) · Chemistry

The correct decreasing order of atomic radii $(\mathrm{pm})$ of $\mathrm{Li}, \mathrm{Be}, \mathrm{B}$ and C is

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

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

Hence, the correct answer is option: 'B'.

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