The number of protons in an atom is referred to as the atomic number of that element. The number of protons also determines the chemical behavior of the element.

Atoms are made up of three smaller particles called protons, electrons and neutrons.

Protons are tiny subatomic particles that, along with neutrons, form the nucleus of an atom. The heavier the atom, the more protons (and neutrons) it contains.

This illustration of the nuclear landscape shows atomic isotopes arranged by an increasing number of protons (up) and neutrons (right). The dark blue blocks represent stable isotopes, while the ...

New research has found that protons are about 20 times more likely to pair up with neutrons than with other protons in the nucleus. The result, based on the first-ever simultaneous measurement of ...

At three seconds of age, let's say the Universe is filled with 85% protons (and an equal number of electrons), 15% neutrons, and about 1-to-2 billion photons for every proton or neutron.

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 atom. A new study comes closer than ever to ...

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 atom. A new study comes closer than ever to ...