Want to learn more about one of science's heroes from history, Henry Moseley? Moseley solved one of chemistry's greatest puzzles - determining what distinguishes elements from one another and developed a means of identifying elements based on their atomic characteristics. Sadly he lost his life fighting at Gallipoli in WWI.
Learn more about his life and legacy by watching our online film here.
The lanthanides and the actinides are usually shown as two additional rows below the main body of the periodic table. Actinides are 15 radioactive metallic chemical elements with atomic numbers from 89 to 103, including thorium, uranium, plutonium and curium. The most abundant actinides on Earth are naturally-occurring uranium and thorium and synthetically-produced plutonium. At least 6 actinides heavier than plutonium have been released into the environment by nuclear weapons tests.
Lanthanides are the 15 metallic chemical elements with atomic numbers 57 through 71, including cerium, neodymium, erbium, thullium and ytterbium. Most of the world's lanthanides are extracted from mineral deposits in Inner Mongolia, in the People's Republic of China.
All isotopes of uranium are unstable, with half-lives varying 4.5 billion down to 159,200 years. Uranium has the highest atomic weight of the primordially occurring elements, nuclides that have existed in their current form since before Earth was formed. Uranium-235, used in nuclear power plants and nuclear weapons, is the only naturally occurring fissile isotope.
Check back soon to learn more about the research we do here at Diamond on Uranium.