Robert S. Mulliken
He gave chemistry its visual language for the modern age, mapping how atoms share electrons to form the bonds of molecules.
1896–1986 (age 90)·American physicist and chemist·Birthday: June 7·The Lost Generation
Biography
Robert Mulliken was a quiet theorist who fundamentally changed how scientists see the invisible world. In the early 20th century, chemistry was grappling with the new rules of quantum mechanics. While others clung to older models of fixed bonds between atoms, Mulliken proposed a radical idea: forget the atoms. Instead, he argued, focus on the molecule as a whole, where electrons live in 'orbitals' that span the entire structure. This concept of molecular orbitals was initially met with skepticism, seen as abstract and less intuitive. But Mulliken, with patient persistence, developed the rigorous mathematical framework to support it. His theory eventually became the universal language of theoretical chemistry, providing the blueprint for understanding everything from the color of dyes to the reactions of life itself. His Nobel Prize in 1966 was a late but definitive recognition that he had provided the most powerful tool yet for explaining why matter holds together.
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.
Robert 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 Robert Was Born
The biggest hits of 1896
Robert'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
1986Died at 90
Challenger disaster; Chernobyl nuclear meltdown
Gas: $0.86/galHome: $66,600Min wage: $3.35/hrPresident: Ronald Reagan"That's What Friends Are For" — Dionne & FriendsBest Picture: Platoon
Key Achievements
- Won the 1966 Nobel Prize in Chemistry for his fundamental work on chemical bonds and the electronic structure of molecules.
- Pioneered and developed molecular orbital theory, the prevailing framework for understanding chemical bonding.
- Introduced key concepts like 'orbital hybridization' and the Mulliken population analysis for assigning electron density.
- Received the Priestley Medal, the American Chemical Society's highest honor, in 1983.
Did You Know?
His father was a professor of organic chemistry at MIT, which deeply influenced his career path.
During World War I, he worked on poison gas research, an experience that turned him toward theoretical rather than applied work.
He was an avid mountain climber and outdoorsman.
The unit for the dipole moment of molecules, the 'debye,' was something he argued against; he preferred the atomic unit, now sometimes called the 'mulliken'.
“It is more rewarding to be original than to be correct.”
