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  4. The maximum number of electrons in an atom in which the last electron filled has the quantum numbers n=3, I= 2 and m=-1 is

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Q. The maximum number of electrons in an atom in which the last electron filled has the quantum numbers $n=3, I= 2$ and $m=-1$ is

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Solution:

$n=3$ and $I=2$ means $3 d$-orbital.
Since five orientations of $d$-orbitals are degenerate, $m=-1$ can be assigned to any one.
For maximum number of electrons as asked, answer should be atomic number $30$ .