The energy of an atom (or ion) in its ground state is –54.4 eV. It may be

Question

Philoid · Accepted 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.