They are the smallest unit of an element that still retains its properties. Skip to main content. Open menu Close ... Learn more about the history of atomic chemistry in this video from Khan Academy.

Explore the concept of chemical elements and the definition of an element in science with this guide for KS3 chemistry students aged 11-14 from BBC Bitesize.

The periodic table’s arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius. Many scientists worked on the ...

Einsteinium is an element with a famous name that almost no one has heard of. With 99 protons and 99 electrons, it sits in obscurity near the bottom of the periodic table of chemical elements ...

The story of caesium’s discovery concerns three men – two men who worked in tandem to announce their discovery on May 10, 1860, and a third who first successfully isolated the element a couple ...

When element 61, also known as promethium, was first isolated by scientists at the Department of Energy's Oak Ridge National Laboratory in 1945, it completed the series of chemical elements known ...

It was declared a success in 2012, and four years later, the International Union of Pure and Applied Chemistry – the world authority on chemistry – officially recognized Element 117 as part of ...