The periodic table has become an icon of science. Its rows and columns provide a tidy way of showcasing the elements — the ingredients that make up the universe. It seems obvious today, but it wasn’t ...

Recognize these rows and columns? You may remember a detail or two about this mighty table’s organization from a long-ago chemistry class. Elements are ordered according to their number of protons, or ...

How is the table organized? The Periodic Table, first compiled by Russian chemist Dmitri Mendeleyev, is organized by the number of protons in the nucleus of each element's atom, known as the atomic ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. When you see the periodic table, what comes to mind? The pieces on a Scrabble board? Maybe you think about your high ...

One hundred fifty years after Russian chemist Dmitri Mendeleev published his system for neatly arranging the elements, the periodic table it gave birth to hangs in every chemistry classroom in the ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. This year is the International Year of the Periodic Table of Chemical Elements—and today (March 6), the modern version ...

If you think back to middle school chemistry, you’ll probably remember trying to memorize the Periodic Table of the Elements. Perhaps the Tom Lehrer song is still ingrained in your head: I wish my ...

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 ...