Nuclear & Particle Physics: Inside the Atom
Nucleus, protons, neutrons and quarks
1:00 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
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Inside the Atom
Let's zoom in and look inside an atom.
From Matter to Atoms
Zoom into matter, and you'll see atoms lined up. Each atom is made of a nucleus at the center and electrons around it.
The Nucleus Is Tiny
A nucleus is about 100,000 times smaller than an atom, yet it holds almost all of the atom's mass.
Protons and Neutrons
A nucleus has positive protons and neutral neutrons. Despite the repulsion between protons, the nuclear force binds them together.
Quarks Inside a Proton
A proton is made of two up quarks and one down quark. Add up their charges, and you get plus one.
Neutrons and Gluons
A neutron is one up and two downs, with zero charge. Quarks are bound together by gluons, so a single quark can't be pulled out on its own.
Inside the Atom
Break matter down, and you reach quarks and electrons. Both are thought to be elementary particles that can't be divided further.
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