= 4.60 Shielding effect and ionization energy Therefore, Z eff for 3d-electron of chromium, The screening constant for 3d-electron of chromium, The screening constant for 4s electron of chromium, = 4.30 Screening constant and Z eff for ChromiumĬhromium has atomic number 24 and the electron configuration according to Slater’s rule for shielding electrons, (1s) 2 (2s 2p) 8 (3s 3p) 8 (3d) 5 (4s) 1. Hence the effective nuclear charge (Z eff) for 3d electron Hence the effective nuclear charge (Z eff) for 4s-electron Vanadium has atomic number 23 and the electron configuration according to the Slater’s rules for shielding electrons, (1s) 2 (2s 2p) 8 (3s 3p) 8 (3d) 3 (4s) 2. Screening Constant and Z eff for Vanadium The new rule is all electrons below the nd subshell or nf-subshell contribute 1.0 each towards the screening constant. But Slater’s rule for d or f-orbital electrons the four and five rules are replaced by new rules for the estimation of screening or shielding effect and effective nuclear charge. Slater’s rule for s or p-electron is quite well for estimating the screening constant of s and p-orbital. ![]() = 3.80 Shielding Constant for d or f-orbital Electron Similarly, shielding constant of oxygen atom, Solution: Electron configuration of carbon and oxygen according to the Slater’s rule for shielding electrons, (1s) 2 (2s, 2p) 4, and (1s) 2 (2s, 2p) 6 respectively. Problem: Calculate the shielding or screening constant for the 2p-electron of carbon and oxygen atom. Hence effective nuclear charge of sodium, Therefore, by using Slater’s rule shielding constant and effective nuclear charge for 3s-electron of sodium atom, Shielding or screening constant of sodiumįor calculating the value shielding constant of inner electrons of the sodium atom, the electron configuration according to Slater’s rule, (1s) 2 (2s, 2p) 8 (3s) 1.
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