Technetium - Periodic Table of Videos
Technetium was the first artificial element. More links and info in full description below ↓↓↓ Support us on Patreon: https://www.patreon.com/periodicvideos Elements Playlist: http://bit.ly/...
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one of the big surprises of the whole Periodic Video project for me, was my actually seeing a sample of Technetium. Before I tell you how I saw it, let me explain why I was surprised. Technetium is one of four elements that were predicted by Mendeleev, to exist in the Periodic Table, but had not yet been discovered. He predicted it first to have an atomic weight of a 100 which he then revised to 99, which was pretty accurate. So, Technetium is element 43 and obviously between Molybdenum which is 42 and Ruthenium which is 44. The real discovery came when two Italians, Emilio Segrè and Carlo Perrier in Palermo in Sicily, were sent a sample of Molybdenum that had been radiated in the cyclotron in Berkeley. It had been radiated with a mix of neutrons a...
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one of the big surprises of the whole Periodic Video project for me, was my actually seeing a sample of Technetium. Before I tell you how I saw it, let me explain why I was surprised. Technetium is one of four elements that were predicted by Mendeleev, to exist in the Periodic Table, but had not yet been discovered. He predicted it first to have an atomic weight of a 100 which he then revised to 99, which was pretty accurate. So, Technetium is element 43 and obviously between Molybdenum which is 42 and Ruthenium which is 44. The real discovery came when two Italians, Emilio Segrè and Carlo Perrier in Palermo in Sicily, were sent a sample of Molybdenum that had been radiated in the cyclotron in Berkeley. It had been radiated with a mix of neutrons a...
