It has been 150 years since Dmitri Mendeleev first published his Periodic Table of the Elements. Since then, the iconic image has become a vital tool for everyone learning and working in science.

This illustration shows a typewriter with the keys depicted as the periodic table. Hands are typing on it, and the sheet of paper coming out of it shows the words "Tales from the table." Credit: Chris ...

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 ...