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

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Presentation transcript:

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

What do you See? http://www.youtube.com/watch?v=owI6Ya73ykI&feature=related&safety_mode=true&persist_safety_mode=1 (Magnet on TV) What do you think?

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

Subatomic particles Subatomic particle Charge Location Electron Negative

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

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.

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

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

Millikan oil-drop experiment Robert Millikan Determined the mass of an electron (9.10 x 10-28 g) & charge of an electron (1.6 x 10-19 C) Millikan oil-drop experiment Millikan Oil Drop Experiment – YouTube

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 http://www.youtube.com/watch?v=yQP4UJhNn0I (How small is an atom?)

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)

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)

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

Diagram of an Atom

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

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.