To **determine the energy of an electron** in the **given quantum level of each ion**, we use:

$\overline{){{\mathbf{E}}}_{{\mathbf{n}}}{\mathbf{=}}{\mathbf{-}}{{\mathbf{R}}}_{{\mathbf{H}}}{\mathbf{\left(}}\frac{\mathbf{1}}{{\mathbf{n}}^{\mathbf{2}}}{\mathbf{\right)}}}$

E_{n} = energy in J

R_{H} = Rydberg constant, 2.178 x 10^{-18} J

n = principal energy level

Determine the energy of an electron in the given quantum level of each of the following ions. (*Hint:* Each of the ions has a different number of protons, but each has only one electron, so the Bohr model applies.)

(a) Li^{2+} with n = 2

(b) O^{7+} with n = 6

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