1. Matter & The Atom

2. Matter is made of atoms

3. Atomic Structure
Nucleus
Protons
Neutrons
Electrons

4. Atomic Structure Electrons Tiny, very light particles
Have a negative electrical charge (-)
Move around the outside of the nucleus

5. Atomic Structure Protons Much larger and heavier than electrons
Protons have a positive charge (+)
Located in the nucleus of the atom 

6. Atomic Structure Neutrons Large and heavy like protons
Neutrons have no electrical charge
Located in the nucleus of the atom 

7. Atomic Structure

8. Describing Atoms Atomic Number = number of protons
The number of protons gives the atom its NAME

9. In a neutral atom, the # of protons EQUALS the number of electrons

10. Describing Atoms
Atomic Mass Number (amu)- equal to the number of protons plus neutrons.
Therefore, the number of neutrons equal the atomic number subtracted from the atomic mass number.