Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

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

  1. A

    Li 

  2. B

    K

  3. C

    H

  4. D

    Na

Solution

As the value of Z (atomic number) increases, energy of orbitals decreases (becomes more –ve value)

order of energy of 2s orbital is

H > Li > Na > K

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