One of the earliest topics encountered by students of chemistry is atomic theory (the structure of the atom). The Building Atoms, Ions and Isotopes HD Lite app is a free app by Carolina Biological ...

Atoms are very small. They have a radius of around 1 × 10 10 metres. This symbol shows that chlorine has 35 particles in the nucleus (protons and neutrons), 17 of which are protons. It also tells us ...

The chemical properties of atoms depend on the number of protons in their nuclei, placing them into the periodic table. However, even chemically identical atoms can have different masses – these ...

This clip shows how carbon is made up from sub-atomic particles. Electron shells are mentioned. Two extra neutrons are added to make an unstable isotope which explodes at the end. This clip could be ...

Elizabeth Williams receives funding from the Australian Research Council. If you’ve ever studied a periodic table of the elements (see below), you’re probably already aware that this table reveals a ...

In this video excerpt from NOVA's "Hunting the Elements," New York Times technology columnist David Pogue explores how isotopes of carbon can be used to determine the age of once-living matter. Learn ...

The finding could be put to use at a new facility opening in 2020 that might create new elements—that is, nuclei with more than 118 protons—in addition to new isotopes of the known elements Scientists ...

Atoms can be more overweight than we thought, a team of scientists in the United States has discovered. They have sent atoms crashing into one another in a particle accelerator to create bloated ...

“Magic numbers” of protons and neutrons can make an atomic nucleus exceptionally stable—and a new one has just been added to the existing menagerie that helps sketch a fuller picture of the ...

Artemis Spyrou receives funding from the US National Science Foundation. Sean Liddick receives funding from the Department of Energy, Office of Science and the Department of Energy, National Nuclear ...

This article was updated June 28 at 4:54 p.m. ET. Scientists have long wondered whether there is a limit to the number of protons and neutrons that can be clustered together to form the nucleus of an ...