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The magnetic quantum is the orbital that an e- occupies. If let's say it is in the p block than it can be in 1 of 3 orbitals. I don't think it matters directly which orbital we stick it in, but just as long as we follow all of the rules (Hund, Aufbau, Pauli)
Magnetic quantum number distinguishes individual orbitals in the subshell (the orientation of an electron). The allowed values for magnetic quantum number are the integers from -l to l (where l is the orbital angular momentum quantum number)
Ml can be within the range of -l to l. You look at the placement of the last electron to determine the value of Ml. For example, if an electron is in the p orbital in the 2nd slot, its Ml would be 0 because it is in the middle of the range from -1 to 1.
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