Friedrich Hund
A quantum pioneer whose namesake 'Hund's Rules' govern the behavior of electrons in atoms, shaping modern chemistry and physics.
1896–1997 (age 101)·German physicist·Birthday: February 4·The Lost Generation
Biography
Friedrich Hund spent his career navigating the strange new world of quantum mechanics, leaving an indelible mark not with a single grand experiment, but with a set of elegant principles. As a theoretical physicist in Göttingen, a hub for the quantum revolution, he worked alongside figures like Heisenberg and Born, developing a deep intuition for the quantum states of atoms and molecules. His most enduring legacy came from meticulously cataloging how electrons fill atomic orbitals, leading to the formulation of Hund's Rules. These rules, taught to every chemistry and physics student, explain why electrons occupy individual orbitals with parallel spins before pairing up, dictating atomic ground states and magnetic properties. Hund's work provided the essential scaffolding that made the abstract mathematics of quantum theory applicable to predicting real chemical behavior, quietly underpinning much of modern materials science and molecular physics.
The Lost Generation
1883–1900
Came of age during World War I. Disillusioned by the carnage, they rejected the certainties of the Victorian era and built modernism from the wreckage — in art, literature, and politics.
Friedrich was born in 1896, placing them squarely in The Lost Generation. The events that shaped this generation — world wars, depression, and rapid industrialization — shaped the world they entered and the choices available to them.
#1 When Friedrich Was Born
The biggest hits of 1896
Friedrich's Life & Times
The world at every milestone
1896Born
First modern Olympic Games held in Athens
President: Grover Cleveland
1901Started school
Queen Victoria dies, ending the Victorian era
President: Theodore Roosevelt
1909Became a teenager
Robert Peary claims to reach the North Pole
President: William Howard Taft
1912Could drive
Titanic sinks on its maiden voyage
President: William Howard Taft
1914Could vote
World War I begins
President: Woodrow Wilson
1917Turned 21
Russian Revolution overthrows the tsar; US enters WWI
President: Woodrow Wilson
1926Turned 30
Robert Goddard launches the first liquid-fueled rocket
President: Calvin Coolidge"Baby Face" — Jan Garber
1936Turned 40
Jesse Owens wins four golds at the Berlin Olympics
Gas: $0.19/galPresident: Franklin D. Roosevelt"The Way You Look Tonight" — Fred AstaireBest Picture: The Great Ziegfeld
1946Turned 50
United Nations holds its first General Assembly
Gas: $0.21/galHome: $5,150Min wage: $0.40/hrPresident: Harry S. Truman"Prisoner of Love" — Perry ComoBest Picture: The Best Years of Our Lives
1956Turned 60
Elvis Presley appears on The Ed Sullivan Show
Gas: $0.30/galHome: $10,050Min wage: $1.00/hrPresident: Dwight D. Eisenhower"Heartbreak Hotel" — Elvis PresleyBest Picture: Around the World in 80 Days
1966Turned 70
Star Trek premieres on television
Gas: $0.32/galHome: $14,200Min wage: $1.25/hrPresident: Lyndon B. Johnson"The Ballad of the Green Berets" — SSgt Barry SadlerBest Picture: A Man for All Seasons
1976Turned 80
Apple Computer founded; US bicentennial
Gas: $0.59/galHome: $29,300Min wage: $2.30/hrPresident: Gerald Ford"Silly Love Songs" — WingsBest Picture: Rocky
1997Died at 101
Princess Diana dies in Paris car crash; Harry Potter published
Gas: $1.23/galHome: $104,100Min wage: $5.15/hrPresident: Bill Clinton"Candle in the Wind 1997" — Elton JohnBest Picture: Titanic
Key Achievements
- Formulated Hund's Rules, which predict the ground state term symbols for atoms and are fundamental to quantum chemistry.
- Made significant contributions to the understanding of molecular quantum theory, particularly the tunnel effect and molecular orbitals.
- His work on the 'Hund-Mulliken' approach was pivotal in the development of molecular orbital theory.
- Authored a highly influential textbook, 'Theoretical Physics', which shaped generations of students.
Did You Know?
He lived to be 101 years old, witnessing nearly the entire development of quantum theory from its birth to maturity.
The term 'Hund's Cases' in molecular spectroscopy also bears his name, describing different coupling regimes for angular momenta.
He initially studied mathematics, geology, and physics, and even considered becoming a geologist.
During World War II, he was appointed to a physics chair in Jena but was later dismissed for political reasons.
““History shows that the most important discoveries are usually made by young people.””
