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Among the second period elements the act...

Among the second period elements the actual ionisation enthalpies are in the order `Li lt B lt Be lt C lt O lt N lt F lt Ne` . Explain why?
O has lower `(Delta_iH)_1` than N and F ?

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Among the second period elements the actual ionisation enthalpies are in the order Li lt B lt Be lt C lt O lt N lt F lt Ne . Explain why? Be has higher (Delta_iH)_1 than B

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