Slater rules:
The value of screening constant and efficient nuclear charge (Z*) can be computed by employing Slater’s rules. According to such rules the value of “S” for a known electron is estimated as follows.
1) Write down the whole electronic configuration of the element and divide the electrons into the following orbital groups beginning from the interior of the atom.
(1s) : (2s, 2p) : (3s, 3p) : (3d) : (4s, 4p) :(4d) : (4f) : (5s, 5p) : (6s, 6p) .......etc.2) Choose the electron for which the value of S is to be computed. For this evaluation add up the contributions to S for other electrons according to the rules shown below.
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