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

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Atomic radius

Electronegativity

Ionization enthalpy

Electron gain enthalpy

answer is A.

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Detailed Solution

We know that

As we move along the period, the atomic radius decreases due to an increase in nuclear charge whereas ionization enthalpy, electronegativity, and electron gain enthalpy increases along the period.

But as we move along the group, the atomic radius increases with the increase in the number of shells but ionization enthalpy, electronegativity, and electron gain enthalpy decreases.

Therefore, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is Atomic radius.

Hence, option(a) is the answer.

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