Glenn Seaborg was a Nobel Science Prize winning scientist for his contribution to the periodic table. At the time of his works, the periodic table had developed far, far from Mendeleev's original periodic table- but still lacked many elements which are found on the table today. He discovered two elements, Californium and more notably Plutonium. Californium, the lesser known of the two, was first made in 1950 by Glenn Seaborg and his team consisting of Stanley Thompson, Kenneth Street Jr., Albert Ghiorso. It had been made by firing helium nuclei (alpha particles) at curium-242. It created the isotope now known as Californium-245 with a half-life of 44 minutes. Curium is very radioactive and it took years for the team to collect the few milligrams required. It only produced 5000 atoms of Californium, but the new element well and truly existed. Plutonium is a radioactive element which first found in 1940 by Glenn Seaborg and his team Arthur Wahl, Joseph Kennedy, and Edwin McMillan. They produced the plutonium by bombarding uranium-238 with deuterium nuclei. Originally from this experiment, they developed plutonium-238 with a half-life of only two days. This experiment created element 94.