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In an atom,the total number of electrons having quantum numbers $n=4, |m_{l}|=1$ and $m_{s}=-\frac{1}{2}$ is:

The number of unpaired electrons in the $Fe^{2+}$ ion is

The azimuthal quantum number is related to

The number of quantum numbers that can have the same values for two electrons in an atom is:

The Aufbau principle is not satisfied by which of the following pairs of elements?

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