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.

A is the mass number (the sum of the protons and neutrons) Z is the atomic number (the number of protons) X is the chemical symbol of the element Note: the number of neutrons in the nucleus can be ...

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.

A theoretical study by RIKEN physicists, published in Physics Letters B, has accurately determined the interaction between a ...

For the first time, a research team has successfully produced one of the most neutron-rich isotopes, hydrogen-6, in an ...

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.