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

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⁺