Question
Why the group 17 (halogen) elements of periodic table have more negative value of electron gain enthalpy?
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Answer
The following reasons are responsible for the more negative value of electron gain enthalpy of group 17 elements : (i) Small atomic size (ii) More effective nuclear charge (iii) $ns ^2 np ^5$ configuration.
Hence their electron gaining tendency is more and they accept an electron and gain the stable electronic configuration $\left( ns ^2 np ^6\right)$ like noble gases.
Hence their electron gaining tendency is more and they accept an electron and gain the stable electronic configuration $\left( ns ^2 np ^6\right)$ like noble gases.
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