High-school chemistry students, beware. Japanese scientists say they have created one of the elements still missing from the periodic table. The elusive element 113—an atom with 113 protons—has to be manmade because it doesn't occur naturally on Earth. On Wednesday, researchers at the RIKEN Nishina Center for Accelerator-Based Science announced the successful creation of the element for the first time. If the atom withstands scrutiny, it will be the first element discovered by an Asian country, giving Japan naming rights. So far, only American, Russian, and German scientists have had the honor. There are about 20 synthetic elements, the first of which was created in 1940.