please tell about the slaters screening constant and his rules of effective nuclear charge

About slaters screening constant and his rules of effective nuclear charge...?

my answer for your question is

slater screening constant:

In quantum chemistry , Slater''s rules provide numerical values for the effective nuclear charge concept. In a many-electron atom, each electron is said to experience less than the actual nuclear charge owing to shielding or screening by the other electrons. For each electron in an atom, Slater''s rules provide a value for the screening constant, denoted by s, S, or σ.

rules:

The shielding constant for each group is formed as the sum of the following contributions:

1. An amount of 0.35 from each other electron within the same group except for the [1s] group, where the other electron contributes only 0.30.
2. If the group is of the [s p] type, an amount of 0.85 from each electron with principal quantum number (n) one less and an amount of 1.00 for each electron with an even smaller principal quantum number
3. If the group is of the [d] or [f], type, an amount of 1.00 for each electron inside it. This includes i) electrons with a smaller principal quantum number and ii) electrons with an equal principal quantum number and a smaller azimutal quantum number (l)

In tabular form, the rules are summarized as:

Approved