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Ions are different from regular atoms because they are charged, either from taking away an electron or adding one. Their electron configuration differs because it will have a greater or smaller number of electrons in the configuration, depending on if the atom becomes a cation or anion
It is also important to keep in mind that in addition to all of this, the number of protons remains the same in the given cation or anion. Isoelectronicity means that the number of valence electrons is the same between two different elements, not the number of protons.
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