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Bell Work (IN): Work in pairs and take a newspapers clipping and a magnifying lens. Observe the newspaper clipping with the magnifying lens to answer the.

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Presentation on theme: "Bell Work (IN): Work in pairs and take a newspapers clipping and a magnifying lens. Observe the newspaper clipping with the magnifying lens to answer the."— Presentation transcript:

1 Bell Work (IN): Work in pairs and take a newspapers clipping and a magnifying lens. Observe the newspaper clipping with the magnifying lens to answer the following question: WHAT DO YOU OBSERVE ABOUT THE PHOTOGRAPHS?

2 Unit 2: Matter Lesson 6: Atoms (History) ________ are made up of small particles. Dalton’s Theory: all atoms of a specific element are identical and atoms __________ be divided into anything smaller. Dalton’s Theory was later revised with new discoveries to conclude that atoms contain subatomic particles.

3 Unit 2: Matter Lesson 6: Atoms (Parts of an Atom) Parts of an Atom: ________(1+), ________(0), and ___________(1-) Protons and Neutrons make up the ________. Electrons are found circling in the _________ __________. The number of protons and electrons in an atom are ________ to each other.

4 Unit 2: Matter Lesson 6: Atoms (Atomic Number and Mass) Elements are distinguished by the number of _______. The number of protons in the nucleus of an atom = the ___________ __________ Isotopes: the same element with the same number of __________ but different number of ___________. For example: You can have one chlorine element with 17 protons and 18 neutrons AND another chlorine element with 17 protons and 20 neutrons. Atomic Mass (mass number) = ________ + ________.

5 Summary (OUT): Dalton published his atomic theory in 1803. Since then, the theory has changed as new information has become available. Describe one thing that current technology allows scientists to do today that would have been impossible in Dalton’s time. A chlorine (Cl) atom contains 17 protons, 18 neutrons, and 17 electrons. How many particles are in the nucleus of this atom? A. 17 B. 18 C. 34 D. 35

6 Activities Honors: Make flashcards that connect each of the scientists involved in the development of the atomic theory with their accomplishments. One side will have the name of the scientist with an illustration and the other side will have the model description with the changes. Demonstrate the following elements: 1.Hydrogen atom 2.Hydrogen isotope 3.Helium atom

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