Chemistry · Bohr model of a hydrogen atom: its postulates, derivation of the relations for the energy of the electron and radii of the different orbits, limitations of Bohr's model
The energy of first excited state of will be:
The energy of first excited state of \( L i^{2+} \) will be:
- A. 13.6 ev
- B. 27.2 ev
- C. 30.6 ev
- D. 40.8 ev
Step-by-step solution
For hydrogen-like ions, energy levels are given by En = -13.6 * Z^2 / n^2 eV. For Li²⁺ (Z=3), the first excited state (n=2) energy is E2 = -13.6 * (3^2)/(2^2) = -13.6 * 9/4 = -30.6 eV. The magnitude is 30.6 eV.
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