Assertion: bismuth | /r/ObjectUse | used in fire detection systems
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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.