Question

Write the configuration of Copper and Chromium.​

Answer 1

2,7

2,8

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Answer 2

Answer:

But note that chromium and copper have 4s1 electron configurations, not 4s2. This is to allow either a half-filled or a filled d sub-shell to be made – Cr has 3d5 4s1 and Cu has 3d10 4s1.