Why Nobel gas have high IE
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because they have stable configuration.their outermost shell is fully filled so it becomes difficult to remove electron from their outermost valence shell.
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Ionisation energy means minimum amount of energy required to remove loosely bonded valence electron of an isolated gaseous atom in its ground state.
Electronic configuration of noble gases are ns^2 np^6.
Ionisation energy is maximum for noble gases due to more stable full filled orbital .If we remove one electron then we need more energy because they have full filled electronic configuration .
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