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STD 11 - 3. Classification of elements and periodicity in properties — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
The group having isoelectronic species is :
  • ✓
    $O^{-2} , F^-, Na^+, Mg^{2+}$
  • B
    $O^-, F^-, Na, Mg^+$
  • C
    $O^{-2} , F^-, Na, Mg^{2+}$
  • D
    $O^-, F^-, Na^+, Mg^{2+}$
✓

Answer

Correct option: A.
$O^{-2} , F^-, Na^+, Mg^{2+}$
a
Isoclectronic species have the same number of electrons. The following ionic species are isoclectronic.

$\begin{array}{lcc}\hline \text { Ions } & {\text { Atomic number }} & {\text { Number of electrons }} \\ \hline 0^{2-} & {8} & {10} \\ {\mathrm{F}^{-}} & {9} & {10} \\ {\mathrm{Na}^{+}} & {11} & {10} \\ {\mathrm{Mg}^{2+}} & {12} & {10} \\ \hline\end{array}$

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