The three quantum numbers for an electron in a hydrogen atom in a certain state are n = 4,l = 2,m_l = 1.The electron is located in what type of orbital? A)4p B)3p C)4s D)4d E)3d

Question

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The quantum numbers n, l, and m describe the energy, shape, and orientation of an atomic orbital respectively. 
In this case, the values of n=4 and l=2 indicate that the electron is in a d orbital since the possible values of l for n=4 are 0, 1, 2, and 3 (s, p, d, and f orbitals respectively). 
The value of m is equal to 1, which indicates that the electron is in one of the five d orbitals that has an orientation where it points along the x-axis. Therefore, the electron is located in a 4d orbital.

The Three Quantum Numbers for an Electron in a Hydrogen