TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
The correct order of the electron gain enthalpy of the given elements is
- A O > Se > S
- B Se > S > O
- C O > S > Se
- D S > O > Se
Answer & Solution
Correct Answer
(A) O > Se > S
Step-by-step Solution
Detailed explanation
Electron gain enthalpy : O(–141) > Se (–195) > S(–200) in kJ/mol Se has 10 'd' electrons which has less shielding effect than 's' or 'p' electrons. Therefore, effective nuclear charge in Se is more than that of 'S'. As a result, it has less electron gain enthalpy.
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