What's the deal with matter? Here's the deal: Matter is made of atoms, and atoms are made of protons, neutrons, and electrons, as well as even smaller particles. It is all described by quantum theory.

The word magic is not often used in the context of science. But in the early 1930s, scientists discovered that some atomic nuclei – the center part of atoms, which make up all matter – were more ...

They have a radius of around 1 × 10 10 metres. 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 ...

Well, atoms are made up of protons, neutrons and electrons ... Learn more about atoms and the Rutherford-Bohr model of an atom in this CCEA Double Award revision guide. Radioactive decay and ...

An element with 17 protons will always be chlorine. 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 ...

We think of matter as being made up from three main particles – protons, neutrons and electrons. However the full set of matter particles is the fermions. This has a much greater variety of sub ...

In Bohr's model, if an electron orbit is not already ... In the 1930s, scientists wondered whether protons and neutrons might also occupy orbits, like electrons. But nobody could show this ...