The Change in Energy of a One-Electron Atom or Ion $\Delta$

question 38

Multiple Choice

The change in energy of a one-electron atom or ion for an electronic transition from the initial energy level n_i to the final energy level n_f is given by
$\Delta$ E = -(2.18*10^-18 J)
Z² $\left( \frac { 1 } { n _ { f } ^ { 2 } } - \frac { 1 } { n _ { i } ^ { 2 } } \right.$
Which of the following species will have the longest wavelength emission line for the transition between the n_i = 2 and n_f = 1 levels?

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

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