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Quantitative calculation of shielding effect of shielding box

Author:admin   AddTime:2021-04-30

How is the shielding effect of the shielding box calculated, do you know? Let's learn about the relevant information together. The quantitative calculation of the shielding effect of the shielding box is as follows:

Z*=Z-σ shielding constant, the electrons in the atom can be divided into the following groups by using the Slater rule: (1s)(2s,2p)(3s,3p)(3d)(4s,4p)(4d )(4f)(5s,5p)(5d)(5f)(6s,6p)(6d)(6f).

1. When the shielded electrons are ns or np, the σ=0.85 for each electron with the principal quantum number (n-1), and σ=1 for each electron with the principal quantum number (n-1).



2. σ=0 for each pair of shielded electrons located to the right of shielded electrons. Approximately, it can be considered that the outer layer of electrons has no shielding effect on the inner layer of electrons.

3. When the shielded electrons are nd or nf, the shielding constant σ=1 of the groups of electrons on their left.

4. The σ between two electrons on the 1s orbital is 0.3, and the σ between the layered electrons with the same principal quantum number is 0.35.

When calculating the σ value of an electron in an atom, it can be obtained by adding the σ value of the shielded electron to the electron. Example 1 Calculate the value of other electrons in an aluminum atom to a 3p electron: The electronic structure of aluminum atom is 1s22s22p63s23p1 = 2×0.35+8×0.85+2×1=9.5.

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