Lutetium is the last of the lanthanides and the hardest of them. The pure metal has been isolated only in 1907 and is one of the most difficult to prepare.

Next

Neptunium is a silvery, ductile, radioactive metal. It is 93rd on the periodic table of elements the first transuranium element to be produced synthetically and the first actinide series transuranium element to be discovered.

Next

Oganesson is element number 118 on the periodic table. It is a radioactive synthetic transactinide element, officially recognized in 2016. Since 2005, only 4 atoms of oganesson have been produced, so there is much to learn about this new element.

Next

Curium is named after chemist and physicist Marie Curie. Curium was identified by Glenn Seaborg, Ralph James and Albert Ghiorso in 1944 at the wartime metallurgical laboratory at the University of Chicago.

Next

Astatine is a radioactive element with the symbol At and atomic number 85. The halogen is the rarest natural element found in the Earth’s crust, as it is only produced from the radioactive decay of even heavier elements.

Next