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JEE Main 201912 AprilEvening Shift
Exam
JEE Main
Year
2019
Date
12 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Structure of Atom

JEE Main 2019 · 12 April · Evening Shift · Chemistry · Structure of Atom

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

Among the following, the energy of 2s2s orbital is lowest in:

Options

  1. AKK
  2. BHH
  3. CNaNa
  4. DLiLi

Correct answer

A. KK

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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