NEETChemistrys Block Elements
Why are potassium and caesium, rather than lithium used in photoelectric cells?
Options
- ABecause potassium and caesium have higher ionization energies compared to lithium.
- BBecause potassium and caesium have lower ionization energies compared to lithium.
- CBecause potassium and caesium have higher electronegativities compared to lithium.
- DBecause potassium and caesium have lower electronegativities compared to lithium.
Correct answer
B. Because potassium and caesium have lower ionization energies compared to lithium.
Step-by-step solution
Correct Option is : (B) Because potassium and caesium have lower ionization energies compared to lithium.