Problem: Two possible electron configurations for an Li atom are shown here. Does either configuration violate Hund’s rule?

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Problem Details

Two possible electron configurations for an Li atom are shown here.

Both configuration A and B have two electrons (one up, one down) in the 1s orbital and one in the 2s orbital.  Configuration A has the 2s electron pointing up while configuration B has it pointing down.

Does either configuration violate Hund’s rule?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Orbital Diagrams concept. If you need more Orbital Diagrams practice, you can also practice Orbital Diagrams practice problems.