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The angular momentum quantum number for the d subshell is l=2, and its corresponding magnetic quantum numbers can have the values -2, -1, 0, 1,& 2 (5 in total). In each of these, there can be 2 electrons, which means that there are a total of 10 electrons that can be placed in the d subshell.
The maximum number of electrons in the d-shell is 10. For the d-shell, l=2 so the magnetic quantum numbers are -2, -1, 0, 1, and 2. This means there are 5 subshells and since 2 electrons can fit in each subshell, there can be a max of 10 electrons in the d-orbital.
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