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Which is the correct increasing order of...

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`

Text Solution

Verified by Experts

The correct Answer is:
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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