Within each pair of elements F & Cl, S & Se, and Li & Na, respectively, the elements that release more energy upon and electron gain are :
Show Hint
- F, S and Li
- Cl, Se and Na
- Cl, S and Li
- F, Se and Na
The Correct Option is C
Solution and Explanation
Step 2: S and Se: S has the more negative electron gain enthalpy (about -200 versus -195 kJ/mol) because it is smaller. So S.
Step 3: Li and Na: Li is smaller and has the more negative electron gain enthalpy (about -60 versus -53 kJ/mol). So Li.
The set is Cl, S and Li.
Answer: (C) Cl, S and Li
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