Question:
The decreasing order of the ionization potential of the following elements is:
The decreasing order of the ionization potential of the following elements is:
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• Ionization potential generally increases across a period
• Half-filled and fully filled subshells are more stable
Updated On: Mar 19, 2026
- Ne > Cl > P > S > Al > Mg
- Ne > Cl > P > S > Mg > Al
- Ne > Cl > S > P > Mg > Al
- Ne > Cl > S > P > Al > Mg
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The Correct Option is B
Solution and Explanation
Step 1: Noble gas Ne has the highest ionization potential.
Step 2: In the same period, Cl has higher ionization potential than P and S.
Step 3: Due to half-filled stability, IE(P) > IE(S).
Step 4: Between Mg and Al, Mg has higher ionization potential because Al has a filled 3s² subshell and a single 3p electron.
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