NTA Abhyas NEET2020ChemistryClassification of Elements and Periodicity in PropertiesPractice
The correct order of 2 nd ionization energy for the elements carbon, nitrogen, oxygen and fluorine is
Options
- AF > O > N > C
- BC > N > O > F
- CO > F > N > C
- DO > N > F > C
Correct answer
C. O > F > N > C
Step-by-step solution
The second ionisation energy means the energy required to remove the electron from the corresponding monovalent cation of the respective atom. For I E 2 , electronic. Configuration of C + , N + , O + and F + -ions which are as follows. C + = 2 s 2 , 2 p 1 N + = 2 s 2 , 2 p 2 O + = 2 s 2 , 2 p 3 F + = 2 s 2 , 2 p 4 ∵ O + is half - filed configuration, obviously it is most stable and greater ionization energy than F + as well as N + . The ionisation energy of an element depends upon its size as. I E ∝ 1 Size of atom