I learned that the electron in a neutral hydrogen atom can be excited to higher levels. But there are different sublevels in the levels. For example s, p, d and f.

Does the electron only jump from s sublevel to s sublevel or can it jump to a p sublevel ?

I also learned that an electron always fills the sublevels in order. Does this mean that an electron in a neutral hydrogen atom can only exists in s sublevels ?

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    $\begingroup$ An electron in H always sits in 1s, unless excited. When excited, it can go anywhere. $\endgroup$ – Ivan Neretin Jan 8 at 22:17
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    $\begingroup$ $2p_y$ is not really a state. $\endgroup$ – Ivan Neretin Jan 8 at 22:25
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    $\begingroup$ Orbitals are not quite the same as states. $\endgroup$ – Ivan Neretin Jan 8 at 22:30
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    $\begingroup$ You should read up about selection rules which govern what spectroscopic transitions are allowed and which not. As a rule of thumb, s-p, p-d, d-f are allowed but not s-s, p-p, s-d etc. $\endgroup$ – porphyrin Jan 9 at 19:54
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    $\begingroup$ An excited hydrogen atom can have an electron in the state with $n=2,\;l=1,\;m=1$. That would be $2p$. But you can't tell whether it is $2p_x$, $2p_y$, or $2p_z$. $\endgroup$ – Ivan Neretin Jan 10 at 14:40

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