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OBQ Practice Questions - Olimpíada Brasileira De Química Exam

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According to Slater's rules, what is the effective nuclear charge (Zeff) experienced by a 4s valence electron in a ground-state neutral zinc atom (Zn, Z = 30, electronic configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2)?
Correct Answer:
4.35

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