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# Derivation of Energy of an Electron

## Derivation of Energy of an Electron

1. Calculate the energy of Li

Answer: E = -13.6(Z

Here, z = 3 and electron exist in 3rd orbit means n = 3

so, E = -13.6(9/9)= -13.6 eV/atom.

2. Calculate the ratio of energies of He

Answer: 9:4

^{+2}ion for 2nd excited state.Answer: E = -13.6(Z

^{2}/n^{2})Here, z = 3 and electron exist in 3rd orbit means n = 3

so, E = -13.6(9/9)= -13.6 eV/atom.

2. Calculate the ratio of energies of He

^{+}for 1st and 2nd excited state.Answer: 9:4