Which of the following has highest ionisation energy ?A. OxygenB. Nitr – InterviewSolution

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1.	Which of the following has highest ionisation energy ?A. OxygenB. NitrogenC. FluorineD. Sulphur
Answer» Correct Answer - D Among oxygen, nitrogen, fluorine and sulphur, the lowest ionisation energy is of sulphur. As their first ionisation values indicated below. N=1402.1 kJ/mol, O=1313.7 kJ/mol, F=1680.8 kJ/mol, S=999.4 kJ/mol. As down the group, the number of inner shells increases. Therefore ionisation energy decreases due to screening effect.

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