MHT CET · Chemistry · Structure of Atom
Which of the following species is NOT isoelectronic with neon?
- A \(\mathrm{O}^{2-}\)
- B \(\mathrm{Na}\)
- C \(\mathrm{Mg}^{2+}\)
- D \(\mathrm{Al}^{3+}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{Na}\)
Step-by-step Solution
Detailed explanation
Atoms and ions having the same number of electrons are isoelectronic.
\(\begin{array}{|l|c|}
\hline {1}{|c|}{\text{ Species}} & \text{No. of electrons} \\
\hline \text{Neon} & 10 \\
\hline \mathrm{O}^{2-} & 8+2=10 \\
\hline \mathrm{Na} & 11 \\
\hline \mathrm{Mg}^{2+} & 12-2=10 \\
\hline \mathrm{Al}^{3+} & 13-3=10 \\
\hline
\end{array}\)
\(\begin{array}{|l|c|}
\hline {1}{|c|}{\text{ Species}} & \text{No. of electrons} \\
\hline \text{Neon} & 10 \\
\hline \mathrm{O}^{2-} & 8+2=10 \\
\hline \mathrm{Na} & 11 \\
\hline \mathrm{Mg}^{2+} & 12-2=10 \\
\hline \mathrm{Al}^{3+} & 13-3=10 \\
\hline
\end{array}\)
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