Question

Which has the more positive electron gain enthalpy in group 15?

Answer 1

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Noble gases have large positive electron gain enthalpy. This is because the extra electron is placed in the next higher principal quantum energy levels.

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Answer 2

Answer:

In case these are made to accept electrons, energy will be needed and electron gain enthalpy will be positive. In case of group -15 elements they have stable half-filled configuration. That is why they have low electron gain enthalpy. Compare the electron gain enthalpy of N and O.