Which of the following isoelectronic ions has lowest IE?

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Strategy:
 Isoelectronic ions share the same number of electrons. The ionization energy () is directly proportional to the nuclear charge (). The ion with the weakest nuclear pull (lowest ) will have the lowest .

Step 1: Identify Z values for 18-electron species
- :  (Protons).
- :  (Protons).
- :  (Protons).
- :  (Protons).
- :  (Protons).

Step 2: Link Z to IE
With 18 electrons to pull, the Sulfur nucleus () exerts the least force. Consequently, removing an electron from the large, weakly hel

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