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Using slaters rule, the effective nuclear charge for a valence electron is 27cr2+ is what?
Accepted Answer
The effective nuclear charge (Zeff) for a valence electron in Cr2+ can be calculated using Slater's rules. Here's how:
1. Electron Configuration: The electron configuration of Cr2+ is [Ar] 3d4.
2. Slater's Rules: According to Slater's rules, electrons in the same shell contribute 0.35 to the shielding constant (S), while electrons in the inner shell contribute 0.85.
3. Shielding Constant (S): For the 3d electrons in Cr2+, there are 3 other 3d electrons and 18 inner shell electrons (from [Ar]). So, S = (3 x 0.35) + (18 x 0.85) = 16.65.
4. Effective Nuclear Charge (Zeff): Zeff = Z - S, where Z is the atomic number of chromium (24). Therefore, Zeff = 24 - 16.65 = 7.35.
Therefore, the effective nuclear charge for a valence electron in Cr2+ is approximately 7.35.
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