Explain why actual electron configurations for chromium & copper from those assigned using the Aufbau diagram?

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Explain why actual electron configurations for chromium & copper from those assigned using the Aufbau diagram?

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2007-08-07 19:40:47 · 2 answers · asked by chrisbel r 2 in Science & Mathematics ➔ Chemistry

2 answers

The 3d and 4s electrons are very close in energy. In Cr, the atom "sees" a half-full d5 configuration as being more stable than a d4, so it "borrows" a 4s electron to end up as 3d5 4s1. Similarly, Cu "sees" a full 3d configuration as being more stable than d9, so borrows a 4s electron to become 3d10 4s1.

2007-08-07 21:03:46 · answer #1 · answered by Gervald F 7 · 0⤊ 0⤋

Aufbau Diagram

2016-09-30 22:53:42 · answer #2 · answered by monte 4 · 0⤊ 0⤋