In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is:
A
Ionization enthalpy
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B
Electron gain enthalpy
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C
Atomic radius
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D
Electronegativity
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Solution
The correct option is C Atomic radius On moving left to right along a period,
Atomic radius ⇒ Decreases.
Electronegativity ⇒ Increases.
Electron gain enthalpy ⇒ Increases.
Ionization enthalpy ⇒ Increases.
Correct option is (d).