Which Happened First?

Discovery of rhenium

Discovery of rhenium
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Rhenium is a chemical element; it has symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.

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

Which happened first?

Timeline

  1. Discovery of protactinium1917
  2. Discovery of hafnium1922
  3. Discovery of rhenium (this page)1925
  4. Discovery of PlutoFebruary 18, 1930
  5. Discovery of technetium1937
  6. Discovery of francium1939

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Discovery of rhenium (1925) · Which Happened First?