Question:
Which of the following is not a periodic property?
Which of the following is not a periodic property?
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Periodic properties arise from the periodic repetition of electronic configurations. Nuclear properties like radioactivity are not periodic.
Updated On: May 12, 2026
- Atomic size
- Electron affinity
- Radioactivity
- Ionisation potential
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The Correct Option is C
Solution and Explanation
Concept:
Periodic properties are those that show a regular trend across a period or down a group in the periodic table. These depend on the electronic configuration of elements.
Step 1: Check each option.
• Atomic size: Decreases across a period, increases down a group — periodic property.
• Electron affinity: Shows periodic trends (generally becomes more negative across a period) — periodic property.
• Radioactivity: This is a nuclear property, not dependent on electronic configuration. It does not show regular periodic trends — not a periodic property.
• Ionisation potential: Increases across a period, decreases down a group — periodic property.
Step 2: Conclusion. Radioactivity is not a periodic property.
Step 1: Check each option.
• Atomic size: Decreases across a period, increases down a group — periodic property.
• Electron affinity: Shows periodic trends (generally becomes more negative across a period) — periodic property.
• Radioactivity: This is a nuclear property, not dependent on electronic configuration. It does not show regular periodic trends — not a periodic property.
• Ionisation potential: Increases across a period, decreases down a group — periodic property.
Step 2: Conclusion. Radioactivity is not a periodic property.
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