I wish i had. I actually thought Helium because after the Hindenburg, zeppelins switched to helium. In fact, the Hindenburg was SUPPOSED to be filled with helium, but the supply was controlled by the Americans and for good reason we didn't export to Germany at that time.
Whilst I understand the "word association", I kind of feel that substituting one of the heaviest elements for the lightest would cause difficulties in getting the thing airborne.
After cheating on the longest half-life answer, I stumbled across Googles answer:
Xenon-124, one of the radioactive noble gases, has an extremely long half-life. The half-life of xenon-124, one isotope of xenon, was recently measured to be a trillion times longer than the age of the universe! This is the slowest process ever measured by direct observation.
Admittedly, even a quick search on Wikipedia lists many, many radioactive elements that have a longer half-life than lead. Though none state a length quite as long as 10^35 years, so I'm probably just missing something.
I work with biochemistry, not physical chemistry, so take my comment with a grain of salt.
In the Wikipedia page, I found that the longest experimentally measured half-life of a radioisotope belonged to Tellurium-128, which is approximately 2.2*10^24 years. I could not find lead anywhere in Wikipedia's page on the list of most stable nuclides, or any mention of 10^35 as one of the half-lives of lead isotopes.
Looking at the Wikipedia article, it may have been a reference to Lead 204, which is observationally stable, meaning we haven't seen it decay, but theorize it would decay to Mercury 200. However, the halflife for that isotope looks to be about 1.4x10^20, so a theoretical lifetime is around 10^35-37. So this could be a misread of that data.
Isotopes of Lead 206, 207, and 208 are expected to have even longer half lives, with lead 208 ~ 2.6x10^21.
I think the element that should be here is Tellurium 128, with a halflife of 2.25x10^24 (only about 160 trillion times the age of the universe)
As to oxygen being the number 1 element in the earth's crust, is in reference to oxygen being part of molecules that make up the surface of the earth? It's certainly not saying that oxygen (O2) is held in liquid form at the bottom of the ocean due to the pressure. I call BS.
The active ingredient in Pepto-Bismol is Bismuth subsalicylate, a compound of bismuth, carbon oxygen and hydrogen. The way the question is worded, it would need to accept all four elements. You could phrase the question as a fill-in-the-blank or in some other way to make it clearer (e.g. add "The active ingredient in Pepto-Bismol: _______ subsalicylate").
Likewise epigastric sore.
Absit dolor in jejuno
Which, post-prandium, not a few know.
Absit atrox vomitus
With its horrid sonitus.
Absit tum insomnia
Bismuth vincit omnia!
Xenon-124, one of the radioactive noble gases, has an extremely long half-life. The half-life of xenon-124, one isotope of xenon, was recently measured to be a trillion times longer than the age of the universe! This is the slowest process ever measured by direct observation.
Who measured it? God?
I work with biochemistry, not physical chemistry, so take my comment with a grain of salt.
Could someone link the information for that here?
Isotopes of Lead 206, 207, and 208 are expected to have even longer half lives, with lead 208 ~ 2.6x10^21.
I think the element that should be here is Tellurium 128, with a halflife of 2.25x10^24 (only about 160 trillion times the age of the universe)
Great quiz!