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Yogita Ingle 5 years ago
Electron gain enthalpy generally becomes more negative across a period as we move from the left to the right. Within a group,m electron gain entahlpy becomes less negative down a group. However, adding an electron to the 2p2p-orbital leads to the greater repulsion than adding an electron to the larger 3p3p-orbital. Hence, the element with the most negative electron gain enthalpy is chlorine, and the one with the least negative electron gain enthalpy is phosphorus.
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