On This Day
·

Plutonium is first produced and isolated by American chemist Glenn T. Seaborg at Berkeley

Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized.

Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen, silicon and hydrogen. When exposed to moist air, it forms oxides and hydrides that can expand the sample up to 70% in volume, which in turn flake off as a powder that is pyrophoric. It is radioactive and can accumulate in bones, which makes the handling of plutonium dangerous.

Plutonium was first synthesized and isolated in late 1940 and early 1941, by deuteron bombardment of uranium-238 in the 1.5-metre (60 in) cyclotron at the University of California, Berkeley.

Historical Significance

Plutonium is a chemical element; it has symbol Pu and atomic number 94.

Events Before

  1. American entertainer Danny Kaye (28) weds American songwriter Sylvia Fine (26) in Fort Lauderdale, Florida, until his de

    American entertainer Danny Kaye (28) weds American songwriter Sylvia Fine (26) in Fort Lauderdale, Florida, until his death in 1987

  2. "The Grapes of Wrath", directed by John Ford and based on John Steinbeck's novel of the same name, starring Henry Fonda

    "The Grapes of Wrath", directed by John Ford and based on John Steinbeck's novel of the same name, starring Henry Fonda and Jane Darwell, is released

  3. American actress Lana Turner (19) weds American bandleader Artie Shaw (29) in a Las Vegas elopement; divorce after 4 mon

    American actress Lana Turner (19) weds American bandleader Artie Shaw (29) in a Las Vegas elopement; divorce after 4 months

  4. Martin Kamen and Sam Ruben discover carbon-14 (radiocarbon dating) at the University of California Radiation Laboratory

    Martin Kamen and Sam Ruben discover carbon-14 (radiocarbon dating) at the University of California Radiation Laboratory in Berkeley, California

  5. Hattie McDaniel becomes 1st African American woman to win an Oscar for "Gone With The Wind"

    Hattie McDaniel (June 10, 1893 – October 26, 1952) was an American actress, singer-songwriter, and comedian.

Events After

  1. World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pled

    World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pledging to make no separate peace deals

  2. The US and 25 other countries sign the Declaration by United Nations against the Axis

    The Declaration by United Nations was the main treaty that formalized the Allies of World War II and was signed by 47 national governments between 1942 and 1945.

  3. Nazi officials hold the notorious Wannsee Conference in Berlin to coordinate the "Final Solution", the extermination of

    Nazi officials hold the notorious Wannsee Conference in Berlin to coordinate the "Final Solution", the extermination of Europe's Jews

  4. Novelist Anthony Burgess (25) weds Llewela Jones

    Novelist Anthony Burgess (25) weds Llewela Jones

  5. Glenn Miller and his Orchestra are awarded the first-ever gold record for selling 1 million copies of "Chattanooga Choo

    Glenn Miller and his Orchestra are awarded the first-ever gold record for selling 1 million copies of "Chattanooga Choo Choo"

More from the 1940s

D-Day: The Normandy Landings

Allied forces launch the largest amphibious invasion in history on the beaches of Normandy, France, marking the beginning of the liberation of Western Europe from Nazi occupation.

wars conflicts

World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pled

World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pledging to make no separate peace deals

Mahatma Gandhi begins a march for peace in East Bengal

Mohandas Karamchand Gandhi (2 October 1869 – 30 January 1948) was an Indian lawyer, anti-colonial nationalist, and political thinker who employed nonviolent resistance to lead the successful campaign…

birth

Omar al-Bashir is born

Omar al-Bashir is born

Frequently Asked Questions

What happened on February 23, 1941?
Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states.
Why is Plutonium is first produced and isolated by American chemist Glenn T. Seaborg... significant?
Plutonium is a chemical element; it has symbol Pu and atomic number 94.

Explore More

February 23 in HistoryYear 1941