That's what made the idea so revolutionary. When he presented the table to the world in , it contained four prominent gaps, one of these was just below manganese and Mendeleev predicted an element with atomic weight 43 and properties similar to its neighbours would be found to fill that gap. He named the missing element ekamanganese. After the other absentees were found and subsequently named Scandium, Gallium and Germanium, the search for ekamanganese intensified.
He actually went on to share the Nobel Prize in physics for discovering the antiproton. So he didn't have much experience of chemistry, but the mineralogist, Carlo Perrier did and together they eventually managed to isolate two radioactive isotopes of the new element, which they named technetium.
The name is from the Greek word for artificial, since technetium was the very first man-made element, yet despite the name, technetium is found naturally albeit in tiny traces.
It's a product of spontaneous uranium fission and although there are no stable isotopes of technetium, you can usually find about a nanogram of technetium in every 5 kilos of the uranium ore, pitchblende.
That's not to say that the stuff is scarce, it's actually a common waste product from nuclear power stations and it's estimated that several tons of technetium have been released into the environment as low level waste over the past half century.
But technetium is also used in about 20 million medical imaging procedures every year. This relies on a form of technetium, which has a half life of about 6 hours.
It decays by emitting a gamma ray, which can be detected by what is effectively a special form of camera. The short half life allows doctors to inject the technetium into a patient in order to light up particular organs in the body and assess how well they work. Hooking the technetium atoms up with certain organic molecules or pharmaceuticals can even allow you to target specific types of tissue.
Because technetium doesn't occur naturally, it doesn't interfere with any of the body's biochemistry, so it's safely excreted after the procedure and since you need so little of the isotope, it keeps the radiation dose really low. Mendeleev could surely have had no idea that years after he predicted the existence of ekamanganese, about 50, people in North America alone would be injected with the stuff every single day.
Mark Peplow telling the tale of technetium. Next time on Chemistry in its element we're sinking to new depths. Even the spark of glamour the metal gets from its association with the world's greatest rock band stems from the eeyorish prediction that they would sink like a lead balloon or zeppelin. And you can hear science writer Phil Ball swinging the lead in next week's edition of Chemistry in its element.
I'm Chris Smith, thank you for listening. See you next time. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by thenakedscientists. There's more information and other episodes of Chemistry in its element on our website at chemistryworld.
Click here to view videos about Technetium. View videos about. Help Text. Learn Chemistry : Your single route to hundreds of free-to-access chemistry teaching resources.
We hope that you enjoy your visit to this Site. We welcome your feedback. Data W. Haynes, ed. Version 1. Coursey, D. Schwab, J. Tsai, and R.
Dragoset, Atomic Weights and Isotopic Compositions version 4. Periodic Table of Videos , accessed December Podcasts Produced by The Naked Scientists. Download our free Periodic Table app for mobile phones and tablets. Explore all elements. D Dysprosium Dubnium Darmstadtium. E Europium Erbium Einsteinium. F Fluorine Francium Fermium Flerovium.
G Gallium Germanium Gadolinium Gold. I Iron Indium Iodine Iridium. K Krypton. O Oxygen Osmium Oganesson. U Uranium.
V Vanadium. X Xenon. Y Yttrium Ytterbium. Z Zinc Zirconium. Membership Become a member Connect with others Supporting individuals Supporting organisations Manage my membership. Facebook Twitter LinkedIn Youtube. Discovery date. Discovered by. Origin of the name. The name is derived from the Greek 'tekhnetos' meaning artificial. Melting point. Boiling point. Atomic number. Relative atomic mass. Key isotopes.
Electron configuration. CAS number. ChemSpider ID. ChemSpider is a free chemical structure database. Electronegativity Pauling scale. Common oxidation states.
ExoForce said:. Thanks CMDR! Memento Mori! Edit: this place is bugged. Next day not a single item. Doing all known tricks Looks like there is a limit. I find it quicker to just farm antimony, tellurium, and ruthenium at the anaconda crash site in orrere.
Then just trade those in at a material trader for technetium. Ownasaur said:. Deleted member Two more Volcanic Sites for Technetium : Code:. Last edited by a moderator: Jul 23, I was in a large ship and couldn't land anyway. Prasinus said:. I believe you have to wait 2 weeks for it to reset. I first saw this material as a requirement for a grade 5 blueprint for Multi-cannons. I looked at it and thought, 'Technetium? That sounds made up for sure. My jaw just about hit the floor when I found out it was an actual element.
Element 42 on the periodic table. As for obtaining it, I usually go to a material trader raw. You must log in or register to reply here. Top Bottom. Iah Lanitei C 1. Iah Lanitei. Mizar D 1. Vestani 1. Norn A 1. HIP 1. Discovery: Technetium was the first element to be produced artificially. Element 43 was predicted on the basis of a gap in the Periodic Table of the Elements , and in its discovery was erroneously reported.
At that time, it was named masurium. Technetium was actually discovered — produced artificially — in by Perrier and Segre in Italy. It was also found in a sample of molybdenum that was bombarded by deuterons in a cyclotron. Since then, scientists have searched for it in terrestrial material. None was found until , when isotope technetium 99 Tc was isolated and identified in African uranium ore in extremely tiny quantities.
It was a spontaneous fission product of uranium.
0コメント