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Question: Answered & Verified by Expert
$\mathrm{Mg}^{2+}$ is isoelectronic with
ChemistryStructure of AtomCOMEDKCOMEDK 2020
Options:
  • A $\mathrm{Ca}^{2+}$
  • B $\mathrm{Na}^{+}$
  • C $\mathrm{Zn}^{2+}$
  • D $\mathrm{Cu}^{2+}$
Solution:
1721 Upvotes Verified Answer
The correct answer is: $\mathrm{Na}^{+}$
Number of electrons in Mgy $=12$
Number of electrons in $\mathrm{Mg}^{2+}=10$
Number of electrons in $\mathrm{Na}^{+}=10$
$\therefore \mathrm{Mg}^{2+}$ is isoelectronic with $\mathrm{Na}^{+}$.

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