This symbol shows that chlorine has 35 particles in the nucleus (protons and neutrons), 17 of which are protons. It also tells us that chlorine has 18 neutrons (35 - 17) and, as the number of ...

Rutherford also put out the idea that there could be a particle with mass but no charge. He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of ...

In 1932, another British physicist, James Chadwick, discovered the neutron, another particle located within the nucleus. With the electron, proton, and neutron, scientists thought they had found ...