First slide

Classical atomic models

Question

Total energy of an atom when electron is in the 1st orbit of hydrogen atom is -13.6eV/atom.
Kinetic energy of electron in the 1st excited state of Li²⁺ ion in eV is:

Moderate

Solution

$\begin{array}{l} K E = 13.6 \times \frac{Z^{2}}{n^{2}} \\ = 13.6 \times \frac{3^{2}}{2^{2}} = 30.6 eV \end{array}$

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