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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?
(1) Be has higher `Delta_(i) H` than B
(2) O has lower `Delta_(i)H` than N and F?

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CHHAYA PUBLICATION-CLASSIFICATION OF ELEMENTS & PERIODICITY IN PROPERTIES-SOLVED NCERT EXERCISE
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