What is the atomic mass of protactinium? What is the atomic mass of tennessine? What is roentgenium's atomic mass? How many neutrons are in calcium? What is the atomic mass of oganesson? What is darmstadtium's atomic mass? What is the atomic mass of berkelium?
During the early 2000s physicists at Russia’s Dubna facility began generating element 118, oganesson2, by fusing calcium and californium one atom at a time. All superheavies are radioactive and many are very short-lived (less than a millisecond for oganesson), so none would be practical for...