Its tricky to verify the existence of super heavy elements; you have to fuse very short-lived materials, hope you get some useful atoms, and wait for someone else to reproduce your achievement. However, scientists at a particle accelerator lab in Germany have managed that rare feat by creating and confirming Element 117, the heaviest substance observed so far. It was produced by smashing together thousands of calcium 48 and berkelium 249 atoms, and is about 40 percent heavier than lead.
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