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Why is the value of electron-gain enthal...

Why is the value of electron-gain enthalpy negative?

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When an eletron is added to a neutral gaseous atom to form a uninegative gaseous ion, energy is usually liberated i.e., the enthalpy change in the process is usually negative. So electron-gain enthalpies of most elements have negative values.
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CHHAYA PUBLICATION-CLASSIFICATION OF ELEMENTS & PERIODICITY IN PROPERTIES-QUESTION-ANSWER ZONE FOR BOARD EXAMINATION
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  11. Why is atomic size of Ca^(2+) smaller than that of K^(+) ?

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