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This was written in a lecture slide:

Two electrons present in the same d-orbital repel each other more strongly than do two electrons in the same s-orbital.

Why is there a difference in the amount of inter electronic repulsion in each orbital? Does it have to do with the shape of the orbital?

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This is because in an s orbital the forces of attraction overcome the forces of repulsion but because d orbitals are considerably further away (sub-atomically speaking) the forces of attraction are far less. This means the repulsing forces are greater because it is being acted on far less.

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