Which Happened First?

Discovery of caesium

Discovery of caesium
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Caesium is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature.

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

Which happened first?

Timeline

  1. Discovery of caesium (this page)1860
  2. Discovery of rubidium1861
  3. Discovery of thallium1861
  4. Discovery of indium1863
  5. Discovery of heliumAugust 18, 1868
  6. Discovery of gallium1875

Related

Play a round with Science · 19th century