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Using Slater’s Rules, the effective nuclear charge for a valence electron for Cobalt (ii) is?
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The effective nuclear charge (Zeff) for a valence electron in Co(II) is calculated using Slater's Rules. Here's the breakdown:
1. Electron Configuration: Co(II) has the electron configuration [Ar]3d7. We are interested in the valence electrons in the 3d orbital.
2. Slater's Rules:
Shielding Constants (S):
For the 3d electrons, electrons in the same shell (n=3) contribute 0.35 each, and electrons in the lower shell (n=2) contribute 0.85 each.
Zeff: Zeff = Z - S, where Z is the atomic number (27 for Cobalt) and S is the shielding constant.
3. Calculation:
3d electrons: S = 6(0.35) = 2.10
2s & 2p electrons: S = 8(0.85) = 6.80
Total S = 2.10 + 6.80 = 8.90
Zeff = 27 - 8.90 = 18.10
Therefore, the effective nuclear charge for a valence electron in Co(II) is approximately 18.10.
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