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Which is the correct increasing order of ionisation energy ?

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Which is the correct increasing order of ionisation energy ?
A. `Li lt B lt Be`
B. `Be lt B lt Li`
C. `Li lt Na lt K`
D. `O lt N lt F`
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Correct Answer - A::D
a. True. `IE_(1)` of `Be gt IE_(1)` of `B`, due to penetration effect.
d. True. `IE_(1)` of `N gt IE_(1)` of `O`, due to half-filled configuration in `N`.
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