1. Tardigrade
  2. Question
  3. Chemistry
  4. The energy of the electron in the 3d -orbital is less than that in the 4s -orbital in the hydrogen atom.

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Q. The energy of the electron in the $3d$ -orbital is less than that in the $4s$ -orbital in the hydrogen atom.

IIT JEEIIT JEE 1983Structure of Atom

Solution:

Aufbau principle.