NCEA L3 Chemistry Practice Questions - NCEA Level 3 Chemistry (New Zealand, Year 13) Exam

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Copper is an exception to the expected orbital filling order. What is the ground-state electron configuration of a neutral copper atom (Cu, Z = 29)?

[Ar] 3d9 4s2 [Ar] 3d10 4s1 [Ar] 3d8 4s2 4p1 [Kr] 3d10 4s1

Correct Answer:

[Ar] 3d10 4s1

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