Question:medium

Which one of the following is not isoelectronic with other isoelectronic species?

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Always check the atomic number ($Z$) and adjust for the charge to find total electrons.
Updated On: Apr 27, 2026
  • $Ca^{2+}$
  • $O^{2-}$
  • $Mg^{2+}$
  • $Na^{+}$
  • $F^{-}$
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The Correct Option is A

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