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Looking at $s$,$p$,$d$ configuration for atoms & ions: Since a hydrogen cation $H^+$ has no electron, how would the subshell notation be written? My best estimate would be $1s^0$.

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What would the subshell be if we assume a muon not being there? –  Georg Oct 8 '11 at 16:58
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Ignoring for a moment the fact that you're describing an electronic configuration with no electrons, yes that's probably fine and I'm sure people will understand it. But then you could just write nothing and get the same information across. Moreover, it's not like a bare proton is waiting there with an empty $1s$ orbital that can accept electrons, more that an electron can enter into an aufbau bound state with the first two quantum numbers being $1$ and $s$. As such, it's not terribly meaningful to talk about a $1s^{0}$ configuration.

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A little correction. An ionized atom's energy level is probably infinite.

So IMHO the notion should be inf s0.

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