Another weekend has arrived, and that means new hints are popping up in Cookie Jam. If you’re stuck on “Au on the periodic ...

Groups of the Periodic table. Alkali metals: The alkali metals make up most of Group 1, the table's first column. Shiny and soft enough to cut with a knife, these metals start with lithium ...

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 ...

Can you name everything from Ac to Zr? Test your knowledge of the periodic table and see if you can top the leaderboard ...

The transition metals are in the block in the middle of the Periodic Table, between Groups 2 and 3. They are all metals and include many common metals such as chromium (Cr), iron (Fe), nickel (Ni ...

Let’s take a tour of some of the most extreme substances on the periodic table. Densest: Osmium Element No. 76 is the heavyweight champion of Earth’s natural materials.

The periodic table is not just the story of discoveries aided by better technological ... when the English physicist Henry Mosley measured the wavelengths of X-rays scattered from different metals.

T he periodic table stares down from the walls of just about every chemistry lab. The credit for its creation generally goes to Dimitri Mendeleev, a Russian chemist who in 1869 wrote out the known ...

Elemental music: Interactive periodic table turns He, Fe, Ca into Do, Re, Mi. Hydrogen has a scale pattern; zinc "sounds like an angelic vocalist singing with vibrato." ...

In other words, it contains elements not on the periodic table at all. These elements would be stable around atomic number 164, which is far denser that Osmium, the densest known naturally ...