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why the second electron gain enthalpy …

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why the second electron gain enthalpy of an atom is always positive?

    • Posted by Shanu Pratap 6 years ago

    CBSE > Class 11 > Chemistry
    • 1 answers

    Yogita Ingle 6 years ago

    When an electron is added to an isolated oxygen atom, it becomes uninegative ion. Now if one more electron has to be added, then it will experience a repulsive force or columbic force of repulsion. Hence more energy has to be supplied for the addition of an electron to this uninegative ion. Therefore , the second electron gain enthalpy is positive for oxygen.

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