Which Happened First?

Discovery of actinium

Discovery of actinium
Image: Oak Ridge National Laboratory · CC BY 2.0 · source

Actinium is a chemical element; it has symbol Ac and atomic number 89. It was discovered by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found in 1899 and called actinium.

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

Which happened first?

Timeline

  1. Discovery of krypton1898
  2. Discovery of neon1898
  3. Discovery of radium1898
  4. Discovery of xenonJuly 12, 1898
  5. Discovery of actinium (this page)1899
  6. Discovery of radon1899

Related

Play a round with Science · 19th century