E=1/n^2 (-13.6eV) for other one-electron atoms –ionized helium (Z=2),

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The discussion centers on the energy formula E=1/n^2 (-13.6eV) as it applies to one-electron atoms, specifically ionized helium (Z=2) and doubly-ionized lithium (Z=3). Participants clarify that while these atoms have only one electron, their atomic number indicates the presence of multiple protons. Ionized helium has two protons, and doubly-ionized lithium has three protons, which explains their classification despite having a single electron.

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E=1/n^2 (-13.6eV) for other one-electron atoms –ionized helium (Z=2), doubly-ionized lithium (Z=3),etc. I found contradicting here is that one-electron atom and Z=2, 3. If it’s one electron, then there is only one proton, so where do 2 or 3 protons come from?
Thanks.
 
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Umm...doubly ionized Lithium is missing two of it's electrons. Hence it has one electron and three protons. That's why it is IONized.
 

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