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Arrange the energy of the $2s$ orbital for hydrogen,lithium,sodium,and potassium in increasing order.

The number of unpaired electrons in $Fe^{3+}$ $(Z = 26)$ is:

Which of the following is correct on the basis of Hund's rule but does not follow Pauli's principle?

The electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 3d^6$ corresponds to:

The correct order of the penetration effect of different orbitals is ..........

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