Q137
General ScienceChemistry
$O^{2-}$ is isoelectronic with
- a.$F^{-}$
- b.$Cl^{-}$
- c.$Li^{+}$
- d.$K^{+}$
Answer: (A) $F^{-}$
Isoelectronic species have the same number of electrons. $O^{2-}$ has 8 protons + 2 extra electrons = 10 electrons. $F^{-}$ (fluorine) has 9 protons + 1 extra electron = 10 electrons. Both have the electronic configuration of neon [He] 2s² 2p⁶. $Cl^{-}$ has 18 electrons, $Li^{+}$ has 2, and $K^{+}$ has 18.