The seventh row of the periodic table is now complete. Four as-yet-unnamed chemical elements — labeled 113, 115, 117, and 118 — mark the first additions to the table since 2011. The elements, which ...

Editor's note: The following is a text-only version. The complete version with artwork is available for purchase here (PDF). The periodic table of the elements is one of the most powerful icons in ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...