Physics
The Structure of World
The Structure of World
11
⚡ Quick Summary
Everything around us is made of atoms and molecules. Atoms have a nucleus with protons and neutrons, and electrons whizzing around. What stuff is like depends on how many protons, neutrons, and electrons it has. And, surprisingly, even those tiny particles aren't the *ultimate* building blocks – there are even smaller 'elementary particles'!
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- The world is made up of atoms and molecules.
- Molecules are composed of atoms.
- Atoms have a nucleus containing protons and neutrons. Electrons move around the nucleus.
- The number of protons, neutrons, and electrons determines the properties of a material.
- Classical physics, which deals with macroscopic objects, may not always be applicable to atoms, molecules, nuclei, or elementary particles.
- There are free transformations from one elementary particle to the other.