Which of the following have the most negative electron gain enthalpy and which will have least negative electron gain enthalpy? P, S , Cl , F
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I think s has least negative cl! And most f
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Electron Gain enthalpy- The energy released when an electron is added to a neutral atom or a molecule in gaseous state to form ion.
Electron gain enthalpy decrease when we move down in a group, this due to the increase in size of the atom. So fluorine should have more negative electron gain enthalpy because of its smallest size followed by Cl. But there is an exception. In case of fluorine, its size is too small, and so it is difficult for fluorine atom to hold extra electron due to repulsion between electrons. While in case of Chlorine, enough space is available there as compared to fluorine. Hence in case of chlorine, there is more space, so there is not much repulsion and hence energy released is more as compared to fluorine.
Hence Chlorine has more negative electron gain enthalpy than fluorine.
Electron gain enthalpy decrease when we move down in a group, this due to the increase in size of the atom. So fluorine should have more negative electron gain enthalpy because of its smallest size followed by Cl. But there is an exception. In case of fluorine, its size is too small, and so it is difficult for fluorine atom to hold extra electron due to repulsion between electrons. While in case of Chlorine, enough space is available there as compared to fluorine. Hence in case of chlorine, there is more space, so there is not much repulsion and hence energy released is more as compared to fluorine.
Hence Chlorine has more negative electron gain enthalpy than fluorine.
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