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Electrons should be filled in orbitals according to their increasing order of energy. This statement is related to .....

In an atom,the order of increasing energy of electrons with quantum numbers $(i)$ $n=4, l=1$,(ii) $n=4, l=0$,(iii) $n=3, l=2$,and (iv) $n=3, l=1$ is:

The maximum number of orbitals which can be identified with $n=4$ and $m_l=0$ is $\qquad$

The electronic configuration of the valence shell of $Cu$ is $3d^{10}4s^{1}$ and not $3d^{9}4s^{2}$. How is this configuration explained?

Which of the following configurations is correct for iron $(Fe)$?

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