exchange energy of 3d^8 subshell?
Answers
Answer:
- In short - Exchange energy is the energy released when two or more electrons with the same spin exchange their positions in the degenerate orbitals of a subshell.
Answer:
Exchange energy is the amount of energy released when electrons of same spin are exchanged their position in degenerate orbitals , as it releases energy decreasing the energy level of degenerate orbital increasing stability, we know half and fully filled orbitals are more stable than other orbitals . We can understand it with the help of two examples chromium and copper ,I.e in chromium there are two possibility of arrangement of electrons in 3d and 4s orbital , first is 4 electrons in 3d orbital and 2 electrons in 4s subshell as per Aufbau principle and other is 5 electrons in 3d orbital and 1 electron in 4s orbital but actually second type configuration is possible which avoids Aufbau principle but it is more stable , we know lower the energy of system more is the stability I.e we have to compare the energy of 3d subshell having four electron system and 3d subshell having 5 electron system whose energy level is low that will be more stable,
In case of copper there are two possibility or electronic arrangement I.e 9 electrons in 3d subshell and 2 electrons in 4s subshell, another arrangement is 10 electrons in 3d subshell and 1 electron in 4s subshell but 1st type of electronic arrangement is in accordance of Aufbau principle but second type arrangement is not in accordance with Aufbau principle, similarly we have to compare the energy of 3d subshell having 9 electron and 3d subshell having 10 electron system whose energy is low that will be more stable,