1. Atoms
Atomic Structure

2. What are the particles that make up all matter?

4. 118 Known Atoms Each atom has a different number of protons
118 different kinds of atoms = 118 different elements on Earth

5. Basic Structure The center of the atom is called the nucleus
The nucleus is surrounded by a an “electron cloud”

6. 3 Subatomic Particles Three kinds of particles make up any atom
Protons
Neutrons
Electrons
These particles are called “subatomic particles” because they are smaller than an atom

7. In the Nucleus
Protons are located in the nucleus and have a positive charge
Neutrons are located in the nucleus and have no charge (they are neutral).

8. In the Electron Cloud
Electrons are located in the space surrounding the nucleus called an electron cloud. Electrons have a negative charge

9. Size and Mass Protons are much bigger than electrons
Protons and neutrons are about the same size

10. Comparing Subatomic Particles