Adobe Document Cloud security overview. Document Cloud is a portfolio of digital document solutions including Acrobat DC, Adobe Sign, and web and mobile apps that makes manual, paper-based processes 100% digital. Learn how Document Cloud uses industry-standard security practices to help protect your documents, data, and personal information.
Early transuranium elements. After the discovery of the neutron by Chadwick in 1932, the group led by Fermi in Rome. began bombarding different elements with neutrons to study the radioactivity induced through. (n,() reactions. The decay characteristics of the radioactivity in neutron-irradiated uranium was. interpreted to indicate that some of the products were probably transuranium elements. Similar. conclusions were reached by other research groups; for example in 1937 Meitner, Hahn and.
There are currently 118 elements, ranging from #1 Hydrogen to #118 Ununoctium. Many of the transuranium elements (#93-#118) are synthetic, meaning that the only place they havâ¦e been found is in a laboratory, thus do not exist in nature. Technetium (#43) and Promethium (#61) are also synthetic.