The Energy of a One-Electron Atom Is Given by E $$\left( \frac { z } { n } \right) ^ { 2 }$$

Multiple Choice

The energy of a one-electron atom is given by E = -(2.18 *10^-18 J) $$\left( \frac { z } { n } \right) ^ { 2 }$$ where Z is the atomic number of the element. Which of the following one-electron ions has the largest ionization energy?

A) Li²⁺
B) Be³⁺
C) He⁺
D) B⁴⁺
E) C⁵⁺