1. Ch. 1 Act. 4 Are atoms indivisible? (pg. 26)

2. What do you See?
(Magnet on TV)
What do you think?

3. Cathode Rays Tube Cathode = negative terminal
Pg. 27
1a.
1b.

4. J.J. Thompson Cathode rays were made of electrons.
Electrons are negatively charged particles.
2a.

5. Subatomic particles Subatomic particle Charge Location Electron
Negative

6. Scientists that helped discover atoms
Discovered
Location
JJ Thompson
Electrons (negative charged)
Cathode Ray Tube/magnet

7. Play Battleship!!
3. Game 1: Ship 8 squares long 3a. How many guesses did it take to win? 3. Game 2: Ship 2 squares long 3b. How many guesses did it take to win? 4a. 5a.

8. J.J. Thompson Cathode rays were made of electrons.
Electrons are negatively charged particles.
Plum Pudding Model

9. Atoms are Neutral
To maintain this electric neutrality, an atom must contain equal number of Protons (positive) and Electrons (negative) charges.

10. Millikan oil-drop experiment
Robert Millikan
Determined the mass of an electron (9.10 x g) & charge of an electron (1.6 x C)
Millikan oil-drop experiment
Millikan Oil Drop Experiment – YouTube

11. Ernest Rutherford Gold Foil Experiment. Nucleus of an atom – YouTube
Discovered the nucleus (center of the atom)
Nucleus made up of protons (+) and neutrons (neutral)….OVERALL positive charge = atomic mass
(How small is an atom?)

12. Scientists that helped discover atoms
Discovered
Location
JJ Thompson
Electrons (negative charged)
Cathode Ray Tube/magnet
Robert Millikan
Charge and mass of electron
Oil drop experiment
Ernest Rutherford
Nucleus (consists of protons and neutrons)
Gold-foil experiment (battleship)

13. Outside the nucleus in orbitals
Subatomic particles
Subatomic particle
Charge
Location
Electron
Negative
Outside the nucleus in orbitals
Protons
Positive
Inside the nucleus
Neutron
Neutral
Atoms are neutral (equal # of electrons (-) and protons (+)
Nucleus is positive (protons positive + neutrons neutral)

14. Atoms ARE Divisible!
Atoms are NEUTRAL and are made up of Subatomic Particles:
1. Electrons: negatively charged particles, in an atom…on the outside of the nucleus in orbitals
2. Protons: positively charged particles, in an atom…inside the nucleus
3. Neutrons: neutral charged particles, in an atom…inside the nucleus

15. Diagram of an Atom

16. 1-2 pg. 22 1-3 pg. 31 1-3, 5 & 8 pg. 33 Answer Questions
Pg. 33 #3 chart:
1-2 pg. 22
1-3 pg. 31
1-3, 5 & 8 pg. 33
Subatomic particles
Electric charge
Location (be very specific)
Proton
Neutron
Electron

17. Battleship Exit Ticket
Draw an atom and label the name and charge of the subatomic particles and in writing explain your drawing…..
The position of the electrons, protons, neutrons and the nucleus.
The charges of the electrons, protons, neutrons and the nucleus.
Using the sentence stem (4 times): The (electrons/protons/neutrons/nucleus) are located __________ and have a (positive/negative/neutral) charge.