Question: Friedrich Hund, creator of Hund's rule of maximum multiplicity, is known for his work on what?
Sentence (from "Hund's rule of maximum multiplicity"): The rule, discovered by Friedrich Hund in 1925, is of important use in atomic chemistry, spectroscopy, and quantum chemistry, and is often abbreviated to Hund's rule, ignoring Hund's other two rules.
Relevant evidence: No