MCQ
The correct stability order of following species is


- A$x > y > w > z$
- B$y > x > w > z$
- ✓$x > w > z > y$
- D$z > x > y > w$

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Assertion $(A):$ The ionic radii of $O ^{2-}$ and $Mg ^{2+}$ are same.
Reason $( R )$ : Both $O ^{2-}$ and $Mg ^{2+}$ are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below