The Energy of a One-Electron Atom or Ion Is Given $\left(-2.178 \times 10^{-18} \mathrm{~J}\right) \frac{Z^{2}}{n^{2}}$

question 9

Multiple Choice

The energy of a one-electron atom or ion is given by $\left(-2.178 \times 10^{-18} \mathrm{~J}\right) \frac{Z^{2}}{n^{2}}$ where Z is the atomic number of the element.Which one-electron ion below would require the most energy to remove its electron?

• A)Li²⁺
• B)Be³⁺
• C)He⁺
• D)B⁴⁺
• E)C⁵⁺

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