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
Choose the correct answer from the options given below :
Solution
<p>The order of first four elements of group-17 are as follows.</p>
<p>$\mathrm{F}<\mathrm{Cl}<\mathrm{Br}<\mathrm{I} \text { (Covalent radius) }$</p>
<p>$\mathrm{Cl}>\mathrm{F}>\mathrm{Br}>\mathrm{I}$ (Electron affinity)</p>
<p>$\mathrm{F}<\mathrm{Cl}^{-}<\mathrm{Br}^{-}<\mathrm{I}$ (Ionic radius)</p>
<p>$\mathrm{F}>\mathrm{Cl}>\mathrm{Br}>\mathrm{I}$ ( $\mathrm{I}^{\mathrm{st}}$ ionization energy)</p>
<p>Electron affinity order is irregular.</p>
About this question
Subject: Chemistry · Chapter: Periodic Table and Periodicity · Topic: Periodic Trends
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