Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications. When you purchase through links on our site, we ...

In this periodic table of elements quiz, you have 10 minutes to name as many elements as you can, given only their symbol, ...

A longstanding mystery of the periodic table involves a group of unique elements called lanthanides. Also known as rare earth ...

By the periodic table’s logic, all d-block elements should have filled s orbitals. But copper defies that logic. It should have the electron configuration [Ar] 3d 9 4s 2.

Today, the periodic table is organized by atomic number, which is the number of protons in the nucleus. But they didn’t know about protons then, so they organized everything by atomic weight.

And for chemistry, no cause for celebration surpasses the origin of the periodic table of the elements, created 150 years ago this March by the Russian chemist Dmitrii Ivanovich Mendeleev.

Instead, they may be made of naturally occurring "superheavy elements" beyond those listed in the periodic table — our current best catalog of 118 chemical elements — new research suggests.

The periodic table is not just the story of discoveries aided by better technological innovations, it’s also the story of sheer genius. Explore. Search Tuesday, Jun 17, 2025. New Delhi o C.

and for whatever complex reasons there is no configuration of neutrons that can stabilize that unhappy nucleus. So, are there elements not on the periodic table that humans can or have invented?