The property/properties that show irregularity in first four elements of group-17 is/are :
(A) Covalent radius
(B) Electron affinity
(C) Ionic radius
(D) First ionization energy
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TestHub · Accepted Answer

The order of first four elements of group-17 are as follows.
$F < Cl < Br < I$ (Covalent radius)
$Cl > F > Br > I$ (Electron affinity)
$F^{-} < Cl^{-} < Br^{-} < I^{-}$ (Ionic radius)
$F > Cl > Br > I (I^{st}$ ionization energy\)
Electron affinity order is irregular.

Chemistry - PERIODIC TABLE Question with Solution | TestHub

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