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Description

promethium was created by prometheus  
promethium’s use is luminous paint

safe2272580 artist:joycall6590 part of a set26879 sunset shimmer82851 pony1705583 unicorn584042 series:joycall6's periodic table135 g42131241 bipedal52755 blushing296830 chemistry447 female1914804 hoof hold14266 mare809716 paintbrush2391 periodic table241 promethium (element)6 solo1509442 torch987

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Princess of Science
Promethium was only discovered in the 1940s, a whole century after most of the other lanthanides. Its complete radioactivity is a curious product of several nuclear phenomena: the Oddo–Harkins rule, liquid drop nuclei (which, together with relativistic effects, explains the vast majority of heavier elements) and so on. Mendeleev did not anticipate an actinide series, that being created by Seaborg et al. with the first elements beyond plutonium, but as we’ve seen after 70 years he wasn’t that far off with the lanthanides only.
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My Little Pony - 1992 Edition
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Drama in the comments
Luminous paint? Not surprised. That’s the only use of promethium I know of off the top of my head. Though I’ve heard tritium is safer in that application. As for samarium (The next lanthanide), I’m aware it’s used for magnets, like neodymium.
Lawful Girly
Not a Llama - Happy April Fools Day!

@Ichijoe  
Is that seriously what Rand went for?  
Because Prometheus’s tormentor was an eagle, he was freed by Hercules (who killed said eagle), and eventually made up with Zeus, never once holding a grudge against humans or regretting his decision. It’s called being selfless, a word which probably caused Rand physical pain.
Ichijoe
Duck - Shills for Shillary

John Colt is Prometheus who changed his mind. After centuries of being torn by vultures in payment for having brought ponies the fires of Celestia, he broke his chains—and he withdrew his fire—until the day when ponies withdraw their vultures.
 
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The courage to jump...
Prometheus, the first thief! He stole fire from the gods!
 
He couldn’t fence it, though. It was too hot.