There are Reasons why even-numbered elements are slightly more stable (although frankly I don't understand them). If you look at the recent timeline (https://e

There are Reasons why even-numbered elements are slightly more stable (although frankly I don't understand them). If you look at the recent timeline (https://en.wikipedia.org/wiki/Discovery_of_chemical_elements https://en.wikipedia.org/wiki/Discovery_of_chemical_elements) 112, 114, 116, 118 were all discovered before 113, 115, 117.