It’s official. Chemistry’s highest gatekeepers have accepted the newly proposed names for elements 113, 115, 117 and 118.

Please welcome to the periodic table: Nihonium, Moscovium, Tennessine and Oganesson.

Scientists first synthesized the new elements between 2002 and 2010, but it wasn’t until December of 2015 that the International Union of Pure and Applied Chemistry officially recognized the discoveries. Then in June of this year the scientists who discovered the super-heavy, highly-reactive elements sent Iupac their suggested names.

After a five-month waiting period when members of the public could ask questions about the new elements, the foursome were approved on Wednesday, formally filling their boxes in chemistry’s most fundamental table.