Question: What is the heaviest element ever measured?
Answer: Oganesson is the heaviest element on the periodic table at No. 118, the last element currently on the chart, weighing in with a whopping atomic mass of about 300. Only a few atoms of the element have ever been created, each of which survived for less than a millisecond. It’s so heavy that physicist theorize about any number of bizarre behaviors it might display compared to more “traditional” element.
