Which of the following options represents the correct ionic radii in Å^° of N^3-, O^2- and F^- , respectively?

Q4 / 160 · TS EAMCET 2021 (06 Aug Shift 1) · Chemistry

Which of the following options represents the correct ionic radii in $Å^{\circ}$ of $\mathrm{N}^{3-}, \mathrm{O}^{2-}$ and $\mathrm{F}^{-}$, respectively?

A
1.71, 1.36 and 1.40
B
1.36, 1.40 and 1.71
Correct answer
C
1.71, 1.40 and 1.36
D
1.40, 1.36 and 1.71

Solution

Among isoelectronic species, greater the negative charge, greater will be the ionic radii. In anionic isoelectronic species there are more numbers of electrons than protons. These protons cannot attract all electrons to come closer. Thus, size of the ion increases. So, correct order is

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

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