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Question
Which of the following arrangements represents the correct order of electron gain enthalpy?
(considering only magnitude of the electron gain enthalpy)
Which of the following arrangements represents the correct order of electron gain enthalpy?
(considering only magnitude of the electron gain enthalpy)
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Solution
The correct option is A Cl>F>S>O
The order of electron gain enthalpies (kJ/mol) is Cl (-349)< F (-328) < S (-200) < O (-141). But if we neglect negative sign and consider magnitude, then Cl>F>S>O.
Electron gain enthalpy becomes more negative across a period while it becomes less negative in a group. However, electron gain enthalpy of O or F is less negative than that of S or Cl. When an electron is added to n = 2 (in case of O or F), the repulsion is more than when it is added to n = 3 (in case of S or CI). an n=2 level is smaller than the n=3 level.
The order of electron gain enthalpies (kJ/mol) is Cl (-349)< F (-328) < S (-200) < O (-141). But if we neglect negative sign and consider magnitude, then Cl>F>S>O.
Electron gain enthalpy becomes more negative across a period while it becomes less negative in a group. However, electron gain enthalpy of O or F is less negative than that of S or Cl. When an electron is added to n = 2 (in case of O or F), the repulsion is more than when it is added to n = 3 (in case of S or CI). an n=2 level is smaller than the n=3 level.
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