Question
Which is higher in energy: the $2 s$ or $2 p$ orbital in hydrogen? Is this also true for helium? Explain.
Step 1
This is because, in a hydrogen atom, there is only one electron, and the energy of an orbital depends only on the principal quantum number (n). Both 2s and 2p orbitals have the same principal quantum number (n=2), so they have the same energy. Show more…
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