On a stage in the United Nations Educational, Scientific, and Cultural Organization headquarters in Paris, Yuri Oganessian holds a microphone in one hand and a small remote control in the other. Over ...

118 elements and seven periods, though just one period of high school chemistry is enough to get confused by it. This week, we’re exploring the history behind the periodic table.

If you ever want to open a chemistry theme restaurant, you should be sure to furnish it with 118 tables — one for each element. Note that it could not be a Greek restaurant, because then the number of ...