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Whenever we calculate the screening constant on an $\ce{f block} $ element, we start calculating from the electron present in the $\ce{(n-2)f orbital}$ and then leftwards. I was a bit confused that the screening constant ($\sigma$) with which we calculated effects of the "effective nuclear charge ($Z^*$)" on the electron present in the valence shell ie: n or does it affect the " effective nuclear charge " on the electron present in n orbital. Please help. Regards

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