Question

${\mathrm{Na}}^{{+}^{}}$is isoelectronic with:

• A. ${\mathrm{Mg}}^{2+}$
• B. $\mathrm{Ne}$
• C. ${\mathrm{Al}}^{3+}$
• D. ${\mathrm{N}}^{3-}$

Answer 1

Answer: (A), (B), (C), (D)

${\mathrm{N}}^{3-}$

Explanation for correct options:

(A) ${\mathrm{Mg}}^{2+}$:

• The species having same number of electrons are known as Isoelectronic species.
• Electronic Configuration of ${\mathrm{Na}}^{+}$ = $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• Number of electrons in ${\mathrm{Na}}^{+}$ = 10
• Electronic Configuration of ${\mathrm{Mg}}^{2+}$= $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• Number of electrons in ${\mathrm{Mg}}^{2+}$ = 10
• Hence, ${\mathrm{Na}}^{+}$ is isoelectronic with ${\mathrm{Mg}}^{2+}$.

(B) $\mathrm{Ne}$:

• Electronic Configuration of ${\mathrm{Na}}^{+}$ = $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• Number of electrons in ${\mathrm{Na}}^{+}$ = 10

• Electronic configuration of $\mathrm{Ne}$ = $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• Number of electrons in $\mathrm{Ne}$ = 10

• Hence, ${\mathrm{Na}}^{+}$ is isoelectronic with $\mathrm{Ne}$.

(C) ${\mathrm{Al}}^{3+}$:

• Electronic Configuration of ${\mathrm{Na}}^{+}$ = $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• Number of electrons in ${\mathrm{Na}}^{+}$ = 10
• Electronic configuration of ${\mathrm{Al}}^{3+}$ = $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• Number of electrons in ${\mathrm{Al}}^{3+}$= 10
• Hence, ${\mathrm{Na}}^{+}$ is isoelectronic with ${\mathrm{Al}}^{3+}$.

(D) ${\mathrm{N}}^{3-}$:

• Electronic Configuration of ${\mathrm{Na}}^{+}$ = $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• Number of electrons in ${\mathrm{Na}}^{+}$ = 10
• Electronic configuration of ${\mathrm{N}}^{3-}$= $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$
• Number of electrons in ${\mathrm{N}}^{3-}$ = 10
• Hence, ${\mathrm{Na}}^{+}$ is isoelectronic with ${\mathrm{N}}^{3-}$

.Therefore, ${\mathrm{Na}}^{+}$ is isoelectronic with ${\mathrm{Mg}}^{2+}$, $\mathrm{Ne}$, ${\mathrm{Al}}^{3+}$ and ${\mathrm{N}}^{3-}$. And the correct options are (A), (B), (C) & (D).