Protons/Electrons:43 Neutrons:55 Shell structure:2,8,18,13,1 Electron configuration:[Kr]4d65s1 Oxidation state:4,6,7 Crystal structure:body hexagonal This rare transition metal was discovered by C. Perrier and E. Segre in 1937 in a sample of molybdenum that had been bomb...
Technetium-99m is a metastable isotope with a half-life of six hours. Technetium-99m emits gamma rays and low energy electrons, forming technetium-99 (half-life 211,000 years). The gamma rays can be photographed using a gamma camera, and technetium-99m is used in 80 to 90 percent of ...
For the nucleus, having an odd "man" out (or proton in this case) means that the process of introducing neutrons to try and "fix it" is harder than it would be if you just had an even number of protons to start out with. The evidence for this is that these odd numbered atoms ...