TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
The set containing the elements with positive electron gain enthalpies is
- A \(\mathrm{S}, \mathrm{Se}, \mathrm{Te}\)
- B \(\mathrm{Kr}, \mathrm{Xe}, \mathrm{Rs}\)
- C \(\mathrm{Cl}, \mathrm{Br}, \mathrm{I}\)
- D \(\mathrm{K}, \mathrm{Rb}, \mathrm{Cs}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{Kr}, \mathrm{Xe}, \mathrm{Rs}\)
Step-by-step Solution
Detailed explanation
Noble gases have large positive electron gain enthalpies because the electron has to enter the next higher principal quantum level leading to a very unstable electronic configuration. So option (2) is correct
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