Where S is a screening constant and the quantity Z e is the effective charge.
2.
Since Z = 2 in this case, the screening constant is S = . 30.
3.
The screening constant, and subsequently the shielded ( or effective ) nuclear charge for each electron is deduced as:
4.
Revised values of screening constants based on computations of atomic structure by the Hartree Fock method were obtained by Enrico Clementi " et al " in the 1960s.
5.
For each electron in an atom, Slater's rules provide a value for the screening constant, denoted by " s ", " S ", or " ? ", which relates the effective and actual nuclear charges as
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