Question

write the electronic configuration of cu.cr​

Answer 1

Since chromium had 4 electrons, which is one short of 5 electrons to get just hslf-filled. To attain a completely filled electronic configuration copper gains one electron from the d-orbital and attains the electronic configuration of (Ar) d10 4s1. Thus both Cr and Cu have exceptional electronic configuration.

Answer 2

Answer:

2. Cu = 29 = 1s² 2s² 2p⁶ 3s² 4p⁶ 4s¹ 3d¹⁰ These electronic configuration are exceptional because electrons entered in 3-d orbitals without filling the 4s orbitals complete. Reason for the Exceptions ⇒ It is said that d orbitals can be stable if it is half filled or full filled