Identify isoelectronic species by counting electrons

1. A.
   Ne
2. B.
   O$^{2-}$
3. C.
   Na
4. D.
   Na$^+$

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1. A.
   $\text{K}^+$
2. B.
   $\text{Ca}$
3. C.
   Mg
4. D.
   Cl

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1. A.
   O$^{2-}$
2. B.
   Na
3. C.
   Mg$^{2+}$
4. D.
   Al$^{3+}$

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1. A.
   F
2. B.
   O
3. C.
   Mg
4. D.
   Ne

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1. A.
   $\text{O}^{2-}$ and $\text{Na}^{+}$
2. B.
   $\text{O}^{2-}$ and $\text{F}^{-}$
3. C.
   $\text{K}$ and $\text{Ca}^{2+}$
4. D.
   $\text{Ar}$ and $\text{Al}^{3+}$

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1. A.
   Ne and $O^{- -}$
2. B.
   ${Cl}^{-}$and Ca
3. C.
   $\ Ar$ and $F^{-}$
4. D.
   $K^{+}$and ${Al}^{+ 3}$

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1. A.
   $\mathrm{Na^+, Cl^-, O^-, NO^+}$
2. B.
   $\mathrm{N_2O, N_2O_4, NO^+, NO}$
3. C.
   $\mathrm{Na^+, Mg^{2+}, O^-, F^-}$
4. D.
   $\mathrm{Ca^{2+}, Ar, K^+, Cl^-}$

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