From the radial probability distribution plots, we can see that:

- principal quantum number, n → corresponds to
**n peaks (or maxima)***1s has 1 maxima, 2**s has 2 maxima, 3**s has 3 maxima*

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**Radial probability distributions for the 1s , 2s , and 3s orbitals of hydrogen.**

*How many maxima would you expect to find in the radial probability function for the 4s orbital of the hydrogen atom?*

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