Verified Solution • 2025–26 Session
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QJEEM19Ch0f96: JEE Main 2019 Chemistry - Class 11 JEEM19Ch0f96 Solution: Among the following, the energy of 2s orbital is lowest in :
Among the following, the energy of 2s orbital is lowest in :
Multiple Choice Options
- A Li
- B H
- C Na
- D K
Step-by-Step Verified Solution
Here Z of K = 15, Na = 11, H = 1, Li = 3.
In K, because of more number of protons (high atomic number) the 2s electron experiences a higher effective nuclear charge and is closer to nucleus, thus having less energy
In K, because of more number of protons (high atomic number) the 2s electron experiences a higher effective nuclear charge and is closer to nucleus, thus having less energy