Environment By Ayda Walsh Share Tweet Share Share In elements with more than 83 protons, all of the isotopes are radioactive. In the Figure above these are the elements with a yellow background. The force of repulsion among all those protons makes the nuclei unstable. Elements with more than 92 protons have such unstable nuclei that they don’t even exist in nature. They have only been created in labs. How useful was this post? Click on a star to rate it! Submit Rating Average rating 0 / 5. Vote count: 0 No votes so far! Be the first to rate this post.