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- What do you think about this? see, and tell us now.
- Here the meaning of the name is noteworthy: [ The discoverers proposed the name "prometheum" (the spelling was subsequently changed), derived from Prometheus, the Titan in Greek mythology who stole fire from Mount Olympus and brought it down to humans, to symbolize "both the daring and the possible misuse of mankind's intellect." ] (here to be understood probably in relation to the benefits and dangers of the [study of] nuclear physics).
- Watch out! Aliens are coming..
- Will there be a Periodic video of tables soon?
- GREAT jammed again youtube sd crap
- @AutomatonGames k for this you have to understand nuclear strong force between nucleons (nucleons r protons and neutrons). theres gravity, electrical, strong and weak nuclear forces as four main forces. electrical force makes like charges repel. strong nuclear forces are what hold protons together. however, it decreases GREATLY with distance, and higher elements are so big that the force cant hold opposite sides together so the atom decays to a lower atom. the higher you go, CONT
- Yeah. That was me. Hi.
- @TheSmashFiles Ok thanks! It all makes sence now!
- Maybe the promethians were made out of promethium
- Take the 720 out. It doesn't look as good as it would without it.
- @AutomatonGames cheers, glad to be of help
- Dumb question..... If the element wasn't known then. How did he (the author) knew to make a space for it in his list of elements?
- I had big plans to watch a movie today. I was waiting for my food to be ready so I could eat when I started the movie, and thought 'I'll just watch a few of these periodic table videos while it's cooking'. An hour later, still no movie.
- put "Pm" instead
- There was no technetium too!
- Plutonium - Pluto, Roman god of the underworld (and a dwarf planet) Promethium - Prometheus, Greek Titan and creator of mankind (and a moon of Saturn) Selenium - Selene, Greek Titan and deity of the Moon Tantalum - Tantalus, Greek ruler and inhabitant of Tartarus (and an asteroid) Thorium - Thor, Norse god of thunder Titanium - the Titans, a Greek race of deities (Titan also being a moon of Saturn) Uranium - Uranus, Greek deity of the sky (and a planet)
- It should be classed as a rare-not-found-on-earth-metal
- No but it might've given radiation sickness :P
- @KarbineKyle It is still not wise to use Pm in paint; tritium is much less dangerous ; )
- @minraja Really wish there was an edit button. I guess maybe the key word would be anticipated. Which is maybe why the scientist prior couldn't lay any claim on helping discover the element.
- @sockington1 What?
- I like looking at those old textbooks!
- I dont understand how you can get synthetic elements. Doesnt that mean there could be endless elements since there are so many combinations? Like Roegnthium or whatever, aka unununium, which isnt found in the natural world. Isnt that kinda the definition though? Can someone explain this to me?
- @AutomatonGames it isn't a combination of the properties of individual elements, it's a combination of the stuff in their nuclei; no matter what you'll have a specific number of protons. in concept you could combine three deuterium nuclei (one proton,one neutron) and get lithium, which would be identical to lithium formed from the combination of helium (two protons,two neutrons) and a single deuterium. the element is determined by the number of protons in its nucleus; nothing more, nothing less.
- @SpaceTime4D Yeah man, chill out.
- Also, Argon (Ar) and Xenon (Xe) had the symbols A and X back then.
- runescape right?
- Brady? Bradium.
- 29000th view
- Promethium-145 (Pm-145) is the most stable. It has a half-life of only 17.7 years, making it highly radioactive. In fact, Pm-147, which has an even shorter half-life of 2.6 years replaced luminous Radium-226 paint. Ra-226, has a half-life of 1602 years, but Pm-147 was used instead for a short time. Some watches, and even LAW rocket launcher sights are painted with Pm-147. Items with Pm-147 paint are very rare! Pm is the only unstable element including Technetium (Tc). Tc-98 is the most stable.
- Both Technetium and Promethium were discovered in the 40s, I believe.
- @porsche911sbs you forgot vanadium which is called after vanadis (a name of Freyja)
- Anthem
- Promethium metal in Daemonheim?
- Tc was not in that book, was discovered in 1937.