He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of these ideas. Chadwick kept the problem in the back of his mind while working on other things.

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.

This symbol shows that chlorine has 35 particles in the nucleus (protons and neutrons ... positive protons but one electron so it is a positive ion. Helium ion, two neutrons, two protons and ...

Quarks are the reason protons have a positive charge. Each quark has a fraction of an electric charge. A proton has two up ...

In the world of nuclear physics, protons often take the spotlight. But now, for the first time, the neutron has stepped ... nucleon by shooting a high-energy electron at it and watching how ...

He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of these ideas. Chadwick kept the problem in the back of his mind while working on other things.