Answer :

We know the energy (E) of an electron according to Bohr’s Model of an atom of atomic number Z is given by,



where n= Principal Quantum Number


For ground state, n=1 is fixed.


For hydrogen, Z=1. So E=-13.6 eV. So, option (a) is wrong.


For deuterium, Z=1. So E =-13.6 eV. So, option (b) is wrong.


For helium ion, Z=2. So E=-54.4 eV. So, option (c ) maybe correct. Let’s check option (d).


For lithium ion, Z=3. So E=-122.4 eV. So, option (d) is wrong.


Hence, option (c ) is the correct answer.

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