Question

Among the following properties, which property trend (in magnitude) is different from other three properties across a period?

• A. Ionisation Enthalpy
• B. Electron gain enthalpy
• C. Electronegativity
• D. Atomic Radius

Answer 1

The correct option is D Atomic Radius

On moving left to right along a period,
Atomic Radius$\Rightarrow$ decreases
Electronegativity$\Rightarrow$ increases
Electron gain enthalpy$\Rightarrow$increases
Ionisation Enthalpy$\Rightarrow$ increases

So, atomic radius has different trend from the other three properties.
Hence, (a) is the correct option.