1. Bell Ringer
What is the smallest part of a living thing (You learned this last year)?

2. Chapter 4 Section 1 Introduction to Atoms

3. Atom Atom An atom is the smallest building block of matter.
It is the smallest part of an element.
Atom

4. Parts of an Atom
Nucleus
Protons
Neutrons
Electrons

5. The Nucleus Consists of the protons and neutrons.
Where most of the mass of the atom is.

6. Positively charged particles # of Protons = Atomic Number

7. Electrons Negatively charged particle. # of Electrons = # of Protons
Electrons are located outside of the nucleus on energy levels in an area called the electron cloud.

8. No charge or neutral # of Neutrons = Mass Number – Atomic Number

9. The Atom

10. Periodic Table

11. Exit Quiz What is the smallest building block of matter?
Name the three subatomic particles in an atom.
What is the positively charged particle called?
What is the particle called that has no charge?