ISIS supports a global community of neutron-scattering researchers, and the work that has been done there shows that Chadwick couldn’t have been more wrong. By the time of Chadwick’s discovery, ...

Recent advancements at the Thomas Jefferson National Accelerator Facility have enabled physicists to explore the internal ...

The kilonova briefly mimicked the conditions immediately following the Big Bang, and allowed scientists to confirm the source ...

The atom is a complex system of particles. It's made up of a central nucleus consisting of protons and neutrons, called nucleons, with electrons orbiting around the nucleus. Nobel prize-winning ...

Nucleons, the particles that make up the nucleus of an atom, are fundamental to understanding the universe's building blocks.

An illustration shows the surface of a speed demon neutron star erupting like an atom bomb. | Credit: Robert Lea (created with Canva) Astronomers have discovered a "dead star" neutron star is ...

Occasionally, and purely by chance, some of these neutrons collide with the nuclei of some of the nitrogen atoms. The nucleus of each nitrogen atom contains seven protons and seven neutrons.

The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and one electron in the region outside the nucleus. The electron and proton are attracted to each other.

For instance, it is now known that in each atom of carbon-12, there is a set number of subatomic particles: six electrons, six protons, and six neutrons. The atom's nucleus and electrons are held ...

It also tells us that chlorine has 18 neutrons (35 - 17) and, as the number of electrons and protons are equal in a neutral atom, chlorine also has 17 electrons. The relative mass of a nucleus is ...

However an element's mass numbers can vary, which means that it can have different numbers of neutrons. So although chlorine has a mass number of 35 which means it has 18 neutrons, it can also ...