# Shielding effect on an electron

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