The correct order of the second ionisation potential of carbon, nitrogen, oxygen and fluorine is
A
`F gt Ogt N gt C`
B
`O gt F gt N gt C`
C
`O gt N gt F gt C`
D
`C gt N gt O gt F`
Text Solution
Verified by Experts
The correct Answer is:
B
The second ionization potential corresponds to the removel of electron from an isolated unipositive ion. The electron configurations of unipositive ions of `C,N, O`, and `F` are as follows: `C^(+)(Z = 6) rArr 1s^(2)2p^(2)2p^(1)` `N^(+)(Z = 7) rArr 1s^(2)2p^(2)2p^(2)` `O^(+) (Z = 8) rArr 1s^(2) 2p^(2)2p^(3)` `F^(+) (Z = 9) rArr 1s^(2) 2p^(2)2p^(4)` Number of shells in these ubnipositive ions is the same, thus, the ionization potential is expected to increase with the increase of nuclear charge. However, `O^(+)` has exactly filled `p` subshell, thus, the removel of an electron from `O^(+)` is relatively difficult. Thus, the correct order is `O gt F gt N gt C`
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Knowledge Check
the correct order of second ionisation potential of carbon ,nitrogen,oxygen and fluorine is
A
`CgtNgtOgtF`
B
`OgtNgtFgtC`
C
`OgtFgtNgtC`
D
`FgtOgtNgtC`
The correct order of 2^(nd) ionisation potential of carbon, nitrogen, oxygen and fluorine is
A
`C gt N gt O F`
B
`O gt N gt F gt C`
C
`O gt F gt N gt C`
D
`F gt O gt N gt C`
The second ionisation potential is
A
Less than the first ionisation potential
B
Equal to the first ionisation potential
C
Greater than the first ionsation potential
D
None of these
R SHARMA-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS-Level -IV
