Question

If the exchange energy is expressed in terms of “K”, then what will be value of exchange
energy in the outermost electronic configuration of chromium​

Answer 1

Answer:

Hope it helps you dear mate ♥️⚘

Explanation:

"Repulsion" among electrons can be roughly speaking split in two main parts: Coulombic repulsion and a penalty due to the fact that electrons are fermions: two electrons with the **same** spin cannot be en the same place. Exchange is nothing but that last piece of electron-electron interaction energy. Exchange favours electrons that otherwise had to live in a state with the same density of probability to have parallel spin. Lets say you have e electrons and 5 d orbitals. You have three options: 1) populate one d orbital with two electrons of opposite spin, 2) occupy two orbitals with antiparallel spins and 3) occupy two orbitals with parallel spins. Case 1 is the less favorable because if both electrons "live' in the same d orbital the average distance between them is the smallest of the three cases and Coulombic repulsion will be the biggest. The difference between cases 2 and 3 is in case three the electrons must to avoid each other more than in case 2 because they have the same spin. Then, the Pauli exclusion principle makes the average distance between electrons larger in case 3 than in case 2. Therefore, electron-electron repulsion is smaller in case 3. This in and attempt to grasp the concepts, but you must understand that the actual picture is a Fermonic many body problem and that going into the details of quantum mechanics is a must if one wants to understand this fully.