1. A look at the atom, close up!

2. Development of modern atomic theory

3. Dalton’s Atom Dalton’s Model says that: All matter is made of individual particles called atoms Atoms are solid spheres

4. Electrons Protons Thompson’s Atom Thompson’s Model says that: Atoms have positive parts called protons and negative parts called electrons The electrons and protons are evenly spread throughout the atom

5. Electrons Protons Rutherford’s Atom -1899 Rutherford’s Model says that: The protons and neutrons are tightly packed in the center of an atom Nucleus

6. Electrons Protons Bohr’s Atom Nucleus Bohr’s Model says that: Electrons are arranged in different rings around the nucleus

7. Electrons Protons Modern Atomic Theory Nucleus Modern atomic theory says that: We cannot predict where the electron will be next Electrons move throughout the shells as ‘clouds of electrons’

8. Atomic Number How is the atomic number found? What is the atomic number of this atom? Do all Carbon atoms have the same atomic number?

9. Atomic Mass How is atomic mass found? What is the atomic mass of this atom? Atomic mass = Atomic Weight

10. Isotopes 4 Protons 4 Neutrons 10 Protons 11 Neutrons 10 Protons 10 Neutrons 6 Protons 4 Neutrons Are these atoms the same element? Are they isotopes? Are these atoms the same element? Are they isotopes?

11. Quiz Tomorrow Organizational levels Modeling atoms (the outside stuff & caps) Subatomic particles Atomic mass Atomic number Isotopes FUN!!!

12. Universe Galaxy Solar System Planet Population Organism Organs Tissues Cells Macromolecules Molecules Atoms Protons, Neutrons, Electrons Organizational Levels Big Small