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JEE Main201912 Apr 2019Evening ShiftChemistryStructure of AtomActual

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

Options

  1. AK
  2. BH
  3. CN a
  4. DL i

Correct answer

A. K

Step-by-step solution

Potassium will have the least energy in its 2s orbital. This is due to the fact that the 2s orbital is closest to the nucleus in potassium because of its greater nuclear charge.

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