Slater's rules
= Slater's rules
{c}
An empirical orbital-screening prescription. Other electrons in an $ns,np$ group count $0.35$ each; electrons in shell $n-1$ count $0.85$, deeper electrons $1.00$, and outer electrons zero. For $1s$, the partner contributes $0.30$. d and f groups use separate rules.<Atomic Shielding Constants by John C. Slater>[1930, printed pp. 58–59]{ref}