Why is electron gain enthalpy of chlorine is more reactive than chlorine?
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Electron gain enthalpy is the energy released when an electron is added to an isolated gaseous atom.
With this definition, consider fluorine. It is the smallest element (with respect to atomic radius) in its period. It also has 7 electrons in its outermost shell, the L (2nd) shell. When you add an electron, there is extra repulsion between these electrons.
In the case of chlorine, it also is the smallest in its period, and has 7 electrons in its outermost shell, the M (3rd) shell in this case. Adding another electron to chlorine is relatively easier, as there is more space, and also the empty d-orbital can accomodate this electron.
Hope this is helpful!
With this definition, consider fluorine. It is the smallest element (with respect to atomic radius) in its period. It also has 7 electrons in its outermost shell, the L (2nd) shell. When you add an electron, there is extra repulsion between these electrons.
In the case of chlorine, it also is the smallest in its period, and has 7 electrons in its outermost shell, the M (3rd) shell in this case. Adding another electron to chlorine is relatively easier, as there is more space, and also the empty d-orbital can accomodate this electron.
Hope this is helpful!
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