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The correct order of second ionisation p...

The correct order of second ionisation potentials of carbon, nitrogen, oxygen and fluroine is

A

`Cgt N gtO gtF`

B

`O gt N gt F gtC`

C

`O gt F gt N gt C`

D

`F gt O gt N gt C`

Text Solution

Verified by Experts

The correct Answer is:
C
The order is `O gt F gt N gt C`
From left to right, the first ionisation potential increases.
`O^(o+) rarr 1s^(2) 2s^(2) 2p^(3)`
After losing one electron. Oxygen atom acquires half-filled stable configuration, so its second ionisation potential becomes larger than the that for fluorine.
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Knowledge Check

  • The correct order of first ionisation potential is

    A
    `KgtNagtLi`
    B
    `BegtMggtCa`
    C
    `BgtCgtN`
    D
    `GegtSigtC`

  • Which has the highest second ionisation potential ?

    A
    Nitrogen
    B
    Carbon
    C
    Oxygen
    D
    Fluorine