Although the easier ionization of radon leads one to expect the most extensive chemistry for that element, the high instability of even the most stableisotope has severely limited studies of it.
The highest known magic number for neutrons alone is 126. Lead, with 82 protons and 126 neutrons, is thus "doubly magic" and the heaviest stableisotope in the periodic table.
目前已知的最大中子数是126,82个质子和126个中子组成了元素周期表中最重最稳定的同位素。
3
What is the lightest element on Earth, with no stableisotope?