Discovery of promethium

Promethium is a generally synthetic chemical element; it has symbol Pm and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only about 500–600 grams naturally occurring in the Earth's crust at any given time.

Summary from Wikipedia (CC BY-SA 4.0) · Dates from Wikidata (CC0)

Which happened first?

• Discovery of promethium happened 1 year after Discovery of americium
• Discovery of promethium happened 1 year after Discovery of curium
• Discovery of promethium happened 4 years after Discovery of plutonium
• Discovery of promethium happened 4 years before Discovery of berkelium
• Discovery of promethium happened 5 years after Discovery of neptunium

Timeline

1. Discovery of neptunium1940
2. Discovery of plutonium1941
3. Discovery of americium1944
4. Discovery of curium1944
5. Discovery of promethium (this page)1945
6. Discovery of berkelium1949

Related

• Discovery of hydrogen1766
• Discovery of oxygen1774
• Discovery of PlutoFebruary 18, 1930
• Discovery of carbon1789
• Discovery of aluminium1825
• Discovery of heliumAugust 18, 1868
• Discovery of nitrogen1772
• Discovery of sulfur1777