1. Tardigrade
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  3. Chemistry
  4. Among the following, the energy of 2s orbital is lowest in :

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Q. Among the following, the energy of $2s$ orbital is lowest in :

JEE MainJEE Main 2019Structure of Atom

Solution:

In $'K', 2s$ orbital feel maximum attraction from nucleus (So having less energy) due to more $Z_{eff}$.