How to Calculate Z Effective?

Use the formula: (Z_{text{eff}} = Z – S)

Identify (Z) as the atomic number

Determine (S) as the shielding constant

Estimate (S) using Slater’s rules

For the same principal shell, count shielding electrons with appropriate weights

For inner-shell electrons, count them as full shielding

Subtract the shielding constant from the atomic number

For hydrogen, (Z_{text{eff}} = 1)

For multi-electron atoms, calculate (Z_{text{eff}}) for the specific electron of interest

Use the result as the effective nuclear charge experienced by that electron