For a hydrogen-like ion of atomic number $Z$, the ground-state energy …

Question

For a hydrogen-like ion of atomic number $Z$, the ground-state energy is:

Accepted Answer

A. $-13.6 Z^2\,	ext{eV}$

For a hydrogen-like single-electron ion of charge $+Ze$, $E_n = -13.6\,Z^2/n^2\,	ext{eV}$.
The ground state has $n = 1$ so $E_1 = -13.6 Z^2\,	ext{eV}$.
For example $\mathrm{He}^+$ ($Z = 2$) has a ground state energy of $-54.4\,	ext{eV}$.

Answer

$-13.6\,	ext{eV}$

Answer

$-13.6 Z\,	ext{eV}$

Answer

$-13.6 / Z^2\,	ext{eV}$

For a hydrogen-like ion of atomic number $Z$, the ground-state energy is:

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