The statement(s) that are correct about the species O 2- , F - , Na + and Mg 2+ . (A) All are isoelectronic (B) All have the same nuclear charge (C) O 2- has the largest ionic radii (D) Mg 2+ has the smallest ionic radii Choose the most appropriate answer from the options given below :

Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2024 — 5 April, Shift 1 — Question 62

The statement(s) that are correct about the species $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}$ and $\mathrm{Mg}^{2+}$ .

(A) All are isoelectronic

(B) All have the same nuclear charge

(D) $\mathrm{Mg}^{2+}$ has the smallest ionic radii

Choose the most appropriate answer from the options given below :

Option A:
(B), (C) and (D) only
Option B:
(A), (B), (C) and (D)
Option C:
(C) and (D) only
Option D:
(A), (C) and (D) only
Correct

Answer: D

Step-by-step solution

$\mathrm{O}^{-2} \quad \mathrm{~F}^{-} \quad \mathrm{Na}^{+} \quad \mathrm{Mg}^{+2}$ $\begin{array}{lllll}\text { (No. of } \mathrm{e}^{-} \text {) } & 10 & 10 & 10 & 10\end{array}$ (Ionic radius)

$\mathrm{O}^{-2}>\mathrm{F}^{-}>\mathrm{Na}^{+}>\mathrm{Mg}^{+2}$ Zeff $\quad \mathrm{O}^{-2}<\mathrm{F}^{-}<\mathrm{Na}^{+}<\mathrm{Mg}^{+2}$

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 5 April, Shift 1
Subject: Chemistry
Chapter: Periodicity of Elements and Periodic Properties
Topic: Valency, Diagonal Relationship, Inert Pair Effect & Other Miscellaneous Properties