## Chemistry: The Central Science (13th Edition)

The relationship here is that the number of nodes for an $s$ orbital is equal to $n-1$.
For an $ns$ orbital, - The number of peaks is equal with the number of principal quantum number $n$, with the outermost peaks being larger than the innermost ones. - The number of nodes is equal to $n-1$. Therefore, the relationship here is that the number of nodes for an $s$ orbital is equal to $n-1$.