In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is:

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Strategy:
 Review basic periodic trends. Many properties like Ionization Enthalpy (), Electronegativity (), and Electron Gain Enthalpy () increase in magnitude across a period, while atomic size decreases.

Step 1: Analyze trends across a period
Moving from left to right in a period:
- Ionization Enthalpy (): Increases due to increased .
- Electronegativity (): Increases as the nucleus attracts electrons more strongly.
- Electron Gain Enthalpy: Becomes more negative (magnitude increases).
- Atom

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