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 ...

Since a nucleus contains protons and neutrons, most of the mass of an atom is concentrated in its nucleus.

What we regard as the nucleus of an atom is a beehive of even smaller particles called quarks struggling against a sticky exchange of gluons. Wherever two quarks of a flavor called 'up' are bound to a ...

An experiment more than 10 years in the making has delivered its first glimpse of the hurricane of particles whirring inside subatomic particles called neutrons ... of an atom is a beehive ...

In 1919 Rutherford had discovered the proton, a positively charged particle within the atom's nucleus ... He called it a neutron, and imagined it as a paired proton and electron.

When building an atom, pay close attention to the particles' electrical charges. Protons have a charge of +1. Electrons have a charge of -1. Neutrons are neutral, as its name implies. A stable ...