What is the actual configuration of copper(Z=29)?Explain about its sta

1.	What is the actual configuration of copper(Z=29)?Explain about its stability.
Answer» SOLUTION :Copper (Z=29) Expected configuration :`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(9)4S^(2)` Actual configuration:`1s^(2)2s^(2)2p^(6)3s^(2)3d^(10)4s^(1)` The reason is that electronic configuration[Ar]`3d^(10)4s^(1)` and not[Ar]`3d^(9)4s^(2)` due the symmetrical distribution andexchange ENERGIES of d electrons. Symmetry leads to stability.The FULL filled configuration have symmet distribution of electrons and hence they are more stable than unsymmetrical configuration.

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