Date in year · 1940 · The 1940s
On December 14, 1940, plutonium (specifically Pu-238) is first isolated at Berkeley, California. Susan Howatch, Willie John McBride, Tom Jones would arrive in the same year.
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1940s
Featured · December 14, 1940
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.
Around 1940
1940 (MCMXL) was a leap year starting on Monday of the Gregorian calendar, the 1940th year of the Common Era (CE) and Anno Domini (AD) designations, the 940th year of the 2nd millennium, the 40th year of the 20th century, and the 1st year of the 1940s decade.
What happened
Chemical element with atomic number 94 (Pu)
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.
Elsewhere that year
The class of 1940
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