Q5 / 160 · AP EAMCET 2021 (23 Aug Shift 1) · Chemistry
Which among the following isoelectronic species has the smallest size?
$$
\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Ne}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{Al}^{3+}, \mathrm{Si}^{4+}
$$
- A$\mathrm{F}^{-}$
- B$\mathrm{Ne}$
- Correct answerC$\mathrm{Si}^{4+}$
- D$\mathrm{Na}^{+}$
Solution
In isoelectronic species, the cation with greater +ve charge has smaller size.
$\because \mathrm{Si}^{4+}$ has the smallest size.
Hence, the correct answer is option: 'C'.