Question

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

• A. Ionization enthalpy
• B. Electron gain enthalpy
• C. Atomic radius
• D. Electronegativity

Answer 1

The correct option is C Atomic radius

On moving left to right along a period,
Atomic radius $\Rightarrow$ Decreases.
Electronegativity $\Rightarrow$ Increases.
Electron gain enthalpy $\Rightarrow$ Increases.
Ionization enthalpy $\Rightarrow$ Increases.
Correct option is (d).