Answer:
Electron gain enthalpy generally becomes
more negative across a period as we move from left to right.
\[\text{Cl S P}\]
Within a group,
electron gain enthalpy becomes less negative down a group. However, adding an
electron to \[2p\]-orbital leads to greater repulsion due to high electron
density than adding an electron to the larger \[3p\]-orbital. Hence, chlorine has
more negative electron gain enthalpy than fluorine.
Therefore, phosphorus has least negative electron gain
enthalpy and chlorine has most negative electron gain enthalpy.
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