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For example when n=3 and l=2 we know this corresponds to 3d. Since l is equal 2 we know the values for ml can be: -2,-1,0,1,2. This tells us how many orbitals there are. In this case it is 5 orbitals. Since there are 2 electrons in each orbital, there are 10 electrons
Also, a way to check if the number of orbitals you have are correct, you can use the formula n^2. The n is the energy level. And to check if you need the number of electrons, you can use the formula 2n^2. It is more important to understand the concept and the n,l,m levels.
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