Question

Electron gain enthalpy of halogens are largely negative why

Answer 1

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Electron gain enthalpy of halogens are largely negative because they can acquire the nearest stable noble gas configuration by accepting an extra electron.

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Answer 2

Electron gain enthalpy of halogens are largely negative as they readily accept an electron.

Explanation:

Electron gain enthalpy is the amount of energy released when an isolated gaseous atom accepts an electron.

$A(g)+e^{-1}\rightarrow A^-(g)$   $\Delta H=-ve$

The general electronic configuartion of halogens is $ns^2np^5$ and thus can easily accept an electron in order to complete its octet. Electron gain enthalpy of halogens are largely negative as large amount of energy is released when they accept electron to acquire noble gas configuration.

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