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While filling up of electrons in the atomic orbitals,the $4s$ orbital is filled before the $3d$ orbital but reverse happens during the ionisation of the atom. Explain why?

Which of the following sets of quantum numbers represents the orbital with the highest energy?

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When the azimuthal quantum number has a value of $l = 0$,the shape of the orbital is

The correct set of four quantum numbers for the valence electron of strontium $(Z=38)$ is:

After the $np$ orbital is completely filled,in which orbital does the next electron enter?

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