In: Chemistry
Slater's Rules:
1) Write the electron configuration for the atom using the
following design;
(1s)(2s,2p)(3s,3p) (3d) (4s,4p) (4d) (4f) (5s,5p)
2) Any electrons to the right of the electron of interest
contributes no shielding. (Approximately correct statement.)
3) All other electrons in the same group as the electron of
interest shield to an extent of 0.35 nuclear charge units
4) If the electron of interest is an s or p electron: All electrons
with one less value of the principal quantum number shield to an
extent of 0.85 units of nuclear charge. All electrons with two less
values of the principal quantum number shield to an extent of 1.00
units.
5) If the electron of interest is an d or f electron: All electrons
to the left shield to an extent of 1.00 units of nuclear
charge.
6) Sum the shielding amounts from steps 2 through 5 and subtract
from the nuclear charge value to obtain the effective nuclear
charge.