I would like to ask two questions about Hund's rules and L-S coupling:(adsbygoogle = window.adsbygoogle || []).push({});

1. Some textbooks state that when doing L-S coupling and applying Hund's rules, "The maximum values of S and L are subject to the condition that no two electrons may have the same pair of values for m(sub s) and m(sub l). I know this is because of the Pauli exclusion principle, but how does this requirement (m(sub s) and m(sub l)) really limit S and L when we are adding the angular momenta?

2. When we are trying to figure out the ground state of Sm (4f)6, why is it wrong to have L = Sum(l) = 6*3?

Finally, I've realized that in discussing Hund's rules and L-S coupling some texts tend to make explanations using symmetry consideration and the others tend to prefer the exclusion principle. Are they two different sets of explanations, or are they equivalent?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Hund's rules confuse me!

Loading...

Similar Threads for Hund's rules confuse |
---|

A In what sense does MWI fail to predict the Born Rule? |

A Why do Feynman rules work? |

I Fermi's golden rule derivation |

I Are special relativity rules encoded in the Dirac equation? |

B Born rule and thermodynamics |

**Physics Forums | Science Articles, Homework Help, Discussion**