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The manganase (ii) ion is known to have a d5 configuration having the following term symbols: 4g, 4d, 4f, 6s,4p. the higest term symbol of higest energy would be?
Accepted Answer
The highest energy term symbol for a d5 configuration is 6S. Here's why:
Term Symbols: Term symbols describe the electronic states of atoms and ions. They are based on the total angular momentum (L), spin angular momentum (S), and the number of electrons (n).
Hund's Rules: To determine the highest energy term symbol, we follow Hund's rules:
1. Maximize S (Spin Multiplicity): A d5 configuration has 5 unpaired electrons, leading to a maximum spin multiplicity of 2S + 1 = 6.
2. Maximize L (Orbital Angular Momentum): For a d5 configuration, the maximum L value occurs when all five d orbitals have parallel spins, giving L = 2 (D term symbol).
3. Lower J (Total Angular Momentum): For a more than half-filled shell (like d5), the lowest J value has the highest energy. For a D term symbol (L=2), the lowest J value is 2 - 5/2 = 1/2, resulting in a 6S1/2 term symbol.
Therefore, the highest energy term symbol for a d5 configuration is 6S.
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