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(C) The periodic trends for the first four elements of group-$17$ $(F, Cl, Br, I)$ are as follows:$1$. Covalent radius: $F < Cl < Br < I$ (Regular tre

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Only $(B)$

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(C) The periodic trends for the first four elements of group-$17$ $(F, Cl, Br, I)$ are as follows:$1$. Covalent radius: $F $2$. Electron gain enthalpy: $Cl > F > Br > I$ (Irregular trend; $F$ has a lower electron gain enthalpy than $Cl$ due to its small size and high inter-electronic repulsion).$3$. Ionic radius: $F^- $4$. First ionization enthalpy: $F > Cl > Br > I$ (Regular trend decreases down the group).Thus, only electron gain enthalpy $(B)$ shows an irregularity in the expected periodic trend.

The property/properties that show irregularity in the periodic trend for the first four elements of group-$17$ $(F, Cl, Br, I)$ is/are:
$(A)$ Covalent radius
$(B)$ Electron gain enthalpy
$(C)$ Ionic radius
$(D)$ First ionization enthalpy

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The property/properties that show irregularity in the periodic trend for the first four elements of group-$17$ $(F, Cl, Br, I)$ is/are:$(A)$ Covalent radius$(B)$ Electron gain enthalpy$(C)$ Ionic radius$(D)$ First ionization enthalpy