List of Iota Sigma Pi chapters

Iota Sigma Pi an American honor society for women in the sciences, especially chemistry. It was created by the merger of three chemistry honor societies for women established in the early 20th century.^[1] Alchemi formed at the University of California in 1900 spread to the University of Southern California and Stanford University.^[1] In 1911, a chemistry honor society was established at the University of Washington.^[1] A third honor society, Iota Sigma Pi, was established at the University of Nebraska in 1912.^[1] The latter two societies merged as Iota Sigma Pi in 1913 and were joined by the three chapters of Alchmi in 1916.^[1]

Following is a list of Iota Sigma Pi chapters, with active chapters indicated in bold and inactive chapters in italics.^[1][2][3]

Chapter	Charter date	Institution (former)	Location	Status	References
Hydrogen	1900	University of California, Berkeley	Berkeley, California	Active	[4][5][a]
Oxygen	1911	University of Washington	Seattle, Washington	Inactive	[b]
Nitrogen	1912	University of Nebraska–Lincoln	Lincoln, Nebraska	Inactive	[6]
Carbon	1913	Stanford University	Stanford, California	Inactive	[a]
Sulfur	1914	University of Southern California	Southern California	Inactive	[a]
Phosphorous	1917	University of Michigan	Ann Arbor, Michigan	Inactive	[c]
Tungsten	1918–1970	University of Colorado Boulder	Boulder, Colorado	Inactive	[7]
Iodine	1918	University of Illinois Urbana-Champaign	East Central Illinois	Inactive	[8]
Aurum	1920–1993	Iowa State University	Ames, Iowa	Inactive	[9]
Ytterbium	1920	Yale University	New Haven, Connecticut	Inactive
Helium	1921	University of Oklahoma	Norman, Oklahoma	Inactive
Mercury	1923	University of Minnesota	Minneapolis and Saint Paul, Minnesota	Active
Radium	May 26, 1923	University of Cincinnati	Cincinnati, Ohio	Active	[10][d]
Platinum	1924	University of Denver	Denver, Colorado	Inactive
Kalium	1924	University of Kansas	Lawrence, Kansas	Inactive
Fluorine	1925	Western Reserve University	Cleveland, Ohio	Active
Iridium	1926	University of Iowa	Iowa City, Iowa	Inactive
Indium	1930	Indiana University Bloomington	Bloomington, Indiana	Active	[11]
Palladium	1930	Pennsylvania State University	University Park, Pennsylvania	Inactive
Tellurium	1930	University of Texas at Austin	Austin, Texas	Inactive
Polonium	1937	George Washington University	Washington D.C.	Inactive
Aurum Iodide	1939		Chicago, Illinois	Active	[12][e]
Uranium	1947	Texas State University	Denton, Texas	Inactive
Columbium	1947	Columbia University	New York City, New York	Inactive
Chlorine	1949	Louisiana State University	Baton Rouge, Louisiana	Active
Manganese	1951	Hunter College	New York City, New York	Inactive
Niobium	1960	Oregon State University	Corvallis, Oregon	Inactive
Osmium	1963	Ohio State University	Columbus, Ohio	Active	[13]
Plutonium	1963	Purdue University	West Lafayette, Indiana	Active	[14][f]
Vanadium	1965	Fordham University	New York City, New York	Active
Neptunium	1966	University of Houston	Houston, Texas	Inactive
Cobalt	1971	Marian College	Indianapolis, Indiana	Inactive	[14][f]
Curium	1973		Washington D.C.	Inactive
Ruthenium	1974	Rutgers University–New Brunswick	New Brunswick, New Jersey	Inactive
Samarium	1978		South Bend, Indiana	Inactive
Argentum	1979	Mary Baldwin College	Staunton, Virginia	Active
Promethium	1979		Portland, Oregon	Inactive
Molybdenum	1981		Boston, Massachusetts	Inactive
Technetium	1987		Rochester, New York	Inactive
Scandium	1989	Furman University	Greenville, South Carolina	Inactive
Lanthanum	1998	Randolph College, Sweet Briar College, and University of Lynchburg	Lynchburg, Virginia	Active	[15]
Cadmium	2004		Albany, New York	Inactive
Einsteinium	2004		Tulsa Oklahoma	Active
Calcium	2005		Southern California	Active
Iron	2011		Greensboro, North Carolina	Active
Meitnerium	2020		Denver and Fort Collins, Colorado	Active
Protactinium	February 7, 2025		Lehigh Valley, Pennsylvania	Active	[16]
		Hillsdale College	Hillsdale, Michigan	Active	[17]
		New York University	New York City, New York	Active	[18]
		Macalester College	Saint Paul, Minnesota	Active	[19]
		University at Buffalo	Buffalo, New York	Active	[20]
Members-at-Large				Active

Notes

1. Formed from a chapter of Alchemi, a regional three-chapter honor society.
2. Chapter formed from a local chemistry honor sorority.
3. Non-standard spelling for Phosphorus used, see overall ref
4. Chapter formed from Sigma Kappa, a local organization for women chemistry majors that was established in 1921.
5. Chapter was formed for Chicago alumnae.
6. Marian College was affiliated with Plutonium until May 1971 when it split off as Cobalt.