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" ... But fortunately, that's not how it works. Fluorine has only one natural isotope, number 19. So when you go add six fluorines to uranium, you know that they're all going to be 19. Any difference in mass from the molecule all comes from the uranium, not the fluorine. So we'll do a little math. If you have a uranium atom that has a mass of 235, and you go and add six other atoms each with a mass of 19 to it, what do you get? (235 + 6*19) = 349. (I won't lie, I used my calculator) And if you have a uranium atom with a mass of 238? (238 + 6*19) = 352. ... "
" ... Since so much about these fields are still unknown, and since the compounds are themselves highly suspicious (Lowe: "one of the ugliest-looking drug candidates I've ever seen (ten fluorines, three aryl rings, no hydrogen bond donors in sight), Lowe asks: is "this a reasonable wager?" ... "