Isoelectronic Question: Oxygen Ion and Isoelectronic Species Comparison

[bobbarkernar]

Homework Statement

which of the following is isoelectronic with the oxygen ion

sulfur ion
chlorine ion
sodium ion
argon

Homework Equations

The Attempt at a Solution

i think the answer is the sulfur ion because it has the same number of valence electrons. is this the correct:::::::::::::

i figured it out it's because they have the same electron configurations
ty

 

[Cesium]

Isoelectronic does not refer to equal number of valence electrons, but rather equal number of electrons (and hence equal electron configurations).

i figured it out it's because they have the same electron configurations

The electron configurations of a sulfur ion and an oxygen ion are not the same.