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Question

What is the energy required to completely remove an electron from the He+ atom if it is initially present in n=3 level?
  1. 48.5 eV
  2. 2.4 eV
  3. 3.8 eV
  4. 6.04 eV


Solution

The correct option is D 6.04 eV
The energy of an electron in nth level is given by 

En=13.6×Z2n2
Here Z is the number of protons in the nucleus. 

For He+ atom, Z=2 and here n=3

Hence, 
E3 = 13.6×2232=6.04 eV
When n goes to infinity, E = 0.
Hence the energy required to remove the electron from third energy level
=EE3
=6.04 eV
 

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