Q3 / 160 · TS EAMCET 2016 · Chemistry

Among the following, the isoelectronic specie (s) is/are (i) $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ (ii) $\mathrm{Na}^{+}, \mathrm{Mg}^{+}, \mathrm{Al}^{3+}, \mathrm{F}^{-}$ (iii) $\mathrm{N}^{3-}, \mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Ne}$

  • A
    (i) and (ii)
  • B
    (i), (ii) and (iii)
  • C
    (ii) and (iii)
  • Correct answer
    D
    (i) and (iii)

Solution

Isoelectronic species are elements or ions that have the same, or equal number of electrons. Hence, $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{Ne}, \mathrm{N}^{3-}, \mathrm{Al}^{3+}$ are isoelectronic species. But $\mathrm{Mg}^{+}$is not isoelectronic with respect to other species.

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

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