TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
Which of the following has the least electron gain enthalpy?
- A Chlorine
- B Iodine
- C Oxygen
- D Sulphur
Answer & Solution
Correct Answer
(C) Oxygen
Step-by-step Solution
Detailed explanation
Halogens like chlorine and iodine have higher electron gain enthalpies due to seven valence electrons, lacking only one for a complete octet. Among oxygen and sulphur, sulphur has a higher electron gain enthalpy than oxygen due to larger size and greater effective nuclear charge.
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