Question

why halogen have large negative electron gain enthalpy​

Answer 1

Explanation:

The halogens have a strong tendency to accept electrons due to their small size and effective nuclear charge so they have maximum negative electron gain enthalpy in their respective periods of the periodic table.

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Answer 2

1. halogens have large negative electron gain enthalpy due to decrease in atomic radii from chlorine to iodine.
2. from clorine to iodine electronegativity decreases due to increase in atomic size.
3. hence halogens are large negative electron gain enthalpy.

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