Question

Noble gases have large positbe electron gain enthalpy values. Why?

Answer 1

The electron gain enthalpy for halogens is highly negative because they can acquire the nearest stablenoble gas configuration by accepting an extra electron. 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

The electron gain enthalpy for halogens is highly negative because they can acquire the nearest stable noble gas configuration by accepting an extra electron. Noble gases have large positive electron gain enthalpy. This is because the extra electron is placed in the next higher principal quantum energy levels.