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What is the effective nuclear charge for valence electron in 27co2+ using slater’s rule
Accepted Answer
The effective nuclear charge (Zeff) for a valence electron in Co2+ (27Co2+) can be calculated using Slater's rules. Here's how:
1. Electron Configuration: The electron configuration of Co2+ is [Ar] 3d7.
2. Slater's Rules: We need to consider the shielding effect of inner electrons on the valence electrons. Slater's rules assign shielding constants to each electron based on its position in the electron configuration.
3d electrons: Each 3d electron shields other 3d electrons by 0.35.
2p electrons (from the [Ar] core): Each 2p electron shields the 3d electrons by 0.85.
3. Calculation:
Zeff = Z - S, where Z is the atomic number (27 for Co) and S is the total shielding constant.
S = (7
0.35) + (18
0.85) = 17.45
Zeff = 27 - 17.45 = 9.55
Therefore, the effective nuclear charge experienced by a valence electron in Co2+ is approximately 9.55.
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