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NEET Class neet Answered

What is the actual order of 2nd I.E. of C,N,O,F ?
Asked by swarnankadas144 | 16 Aug, 2019, 10:52: PM
answered-by-expert Expert Answer

The correct order of second ionisation potential of carbon, nitrogen, oxygen, fluorine is:

O>F>N>C. 

Nitrogen: [He] 2s2 2p3  

Oxygen: [He] 2s2 2p4   

Florine: [He] 2s2 2p5  

Carbon: [He] 2s2 2p

After removing one electron: 

Nitrogen: [He] 2s2 2p2  - After removal of one more electron, it will have only one electron in its outermost p-subshell.

Oxygen: [He] 2s2 2p3  -  After removal of one more electron, it will have two electrons in p-subshell which makes it very unstable.

                                     Also it is difficult to remove electron form stable configuration (half filled). More energy is required to remove electron, so the ionisation potential is very high.

Fluorine: [He] 2s2 2p- After removal of one more electron, it will occupy stable half-filled configuration. 

Carbon: [He] 2s2 2p1 -  After removal of one more electron, it will occupy ideal gas configuration. Hence it will easily give away second electron having very low second IP. 

Answered by Varsha | 19 Aug, 2019, 02:29: PM
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