Since l varies from 0 to n-1, for n=3 l is equal to 0, 1, 2
m varies from -l to +l
Thus, m is equal to -2, -1, 0, 1, or 2 for l=2
m is equal to -1,0,1 for l=1
m is equal to 0 for l=0
So, there are 9 hydrogen orbitals with n=3 and with different values of l and m
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