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3 March, 18:11

The following values are the only allowable energy levels of a hypothetical one-electron atom:

E₆ = - 2 x 10⁻¹⁹ J

E₅ = - 7 x 10⁻¹⁹ J

E₄ = - 11 x 10⁻¹⁹ J

E₃ = - 15 x 10⁻¹⁹ J

E₂ = - 15 x 10⁻¹⁹ J

E₁ = - 15 x 10⁻¹⁹ J

(a) If the electron were in the n = 3 level, what would be the highest frequency (and minimum wavelength) of radiation that could be emitted? (b) What is the ionization energy (in kJ/mol) of the atom in its ground state? (c) If the electron were in the n = 4 level, what would be the shortest wavelength (in nm) of radiation that could be absorbed without causing ionization?

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  1. 3 March, 22:02
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    a) All the electronic levels below n = 3 have same energy so there will not be any evolution of energy in electronic transition from n=3 to n=2 or to n = 1.

    b) Ionisation energy of ground state = 15 x 10⁻¹⁹ J per electron

    = 15 x 10⁻¹⁹ x 6.02 x 10²³ J / mol

    = 90 x 10⁴ J/mol

    = 900 kJ / mol

    c) the shortest wavelength (in nm) of radiation that could be absorbed without causing ionization will correspond to n = 4 to n = 6

    = (11 - 2) x 10⁻¹⁹ J

    = 9 X 10⁻¹⁹ J

    = 9 X 10⁻¹⁹ J / 1.6 X 10⁻¹⁹

    = 5.625 eV

    = 1244 / 5.625 nm

    = 221.155 nm
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