Assertion: bismuth | /r/HasProperty | the heaviest element
Facets:
Source sentences:
text: Until recently, bismuth was considered the heaviest element that still had a stable nucleus.
text: Alpha particles have very little penetrating power—a sheet of paper or human skin completely stops them, and bismuth is a heavy element with far greater absorption than those light substances.
text: Bismuth, which has the atomic number 83, was once considered to be the heaviest element to exist in nature, but later it was found out that bismuth-209 exhibited radioactivity and had unstable properties which thereby decays into thallium-205.It is used in automatic fire sprinkler systems, fire detection systems, electrical fuses, curing gastric ulcers and to make permanent magnets.
text: Until recently, bismuth was considered the heaviest element that still had a stable nucleus.