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| 1. |
Electronic configurations of Cu and Cr? |
| Answer» The Electronic configuration of Cr and Cu are given below ⇒\xa01. Cr = 24 = 1s² 2s² 2p⁶ 3s² 4p⁶ 4s¹ 3d⁵2. Cu = 29 = 1s² 2s² 2p⁶ 3s² 4p⁶ 4s¹ 3d¹⁰\xa0These 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.Thus, In the given case, electrons reaches near the half filled and full filled thus due to the attraction one electrons from the s orbitals came in d orbitals.<br>Electronic configuration of Chromium, with atomic number\xa024=1s22s22p63s23p64s13d5.Electronic configuration of Copper, with atomic number\xa029=1s22s22p63s23p64s13d10. | |