Question

Which of the following atoms and ions are isoelectronic (i.e have the same number of electrons) with a neon atom?
C , O${}^{2-}$ , N${}^{-}$ , F${}^{-}$ , Na${}^{+}$ , Al${}^{3+}$

• A. N${}^{-}$, Na${}^{+}$, Al${}^{3+}$
• B. C, O${}^{2-}$, Na${}^{+}$, F${}^{-}$
• C. $O^{2-}$, Na${}^{+}$, $A{l}^{3+}$
• D. C, O${}^{2-}$, F${}^{-}$, Al${}^{3+}$

Answer 1

The correct option is C $O^{2-}$, Na${}^{+}$, $A{l}^{3+}$

Isoelectronic species : They are the atoms, molecules or ions which have the same number of electrons.
$O^{2-}$ $N{a}^{+}$ $A{l}^{3+}$

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