Write the electronic configuration of cr+3 and cu
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After the 4s is full we put the remaining four electrons in the 3d orbital and end with 3d4. Therefore the expected electron configuration for Chromium will be 1s22s22p63s23p44s23d9. Note that when writing the electron configuration for an atom like Cr, the 3d is usually written before the 4s.
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Explanation: chromium exist as [Ar]3d^5 4s^1
Chromium +3 ion configuration is [Ar]3d^3 4s^0
Configuration of copper is [Ar]3d^10 4s^1
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