Q45 / 170 · Manipal (MET) 2015 · Chemistry

Which of the following has largest ionic radius?

  • Correct answer
    A
    $\mathrm{Cs}^{+}$
  • B
    $\mathrm{Li}^{+}$
  • C
    $\mathrm{Na}^{+}$
  • D
    $\mathrm{K}^{+}$

Solution

Atomic and ionic radii increase from top to bottom in a group due to the inclusion of another shell at every step. Hence, $\mathrm{Cs}^{+}$ion will be the largest among given IA group ions, i.e. $\mathrm{Na}^{+}, \mathrm{Li}^{+}$and $\mathrm{K}^{+}$.

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

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