Atomic Theory Day 2: Scientists of the ATOM Name Date Period

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Atomic Theory Day 2: Scientists of the ATOM Name Date Period Essential Idea: How do scientists determine the properties of something they cannot see? Activity: 1) From the information given, (development of the atomic through the last 2500 years) create a poster that outlines the following for each scientist: Year/ time Belief/ philosophy Experiment that they conducted to validate their beliefs (if any) Discovery/ contribution Resulting : name and drawing 2) PUT UP YOUR POSTER then as you walk around the room complete the chart below which you will use to answer the questions as a group. Scientist Year Belief/ philosophy Democritus Experiment Discovery/ contribution Model Dalton Thomson

Rutherford Bohr Modern 3) After you return to your seat and discuss with your group, label each below to reflect the scientist and name of. Scientist: Model: HW: Reflection: On a separate sheet of paper, write a (minimum) three paragraph news story about the discovery of one of the s above. Place yourself into the time when the was discovered, and imagine your audience does not understand the discovery or its importance. - Include one image / drawing / graphic

Video: The 2400-year search for the atom Activity: 1) From the information given in the article, (development of the atomic through the last 2500 years) create a poster that outlines the following for each scientist: Year/ time Belief/ philosophy Experiment that they conducted to validate their beliefs (if any) Discovery/ contribution Resulting : name and drawing 2) PUT UP YOUR POSTER then as you walk around the room complete the chart below which you will use to answer the questions as a group. Critique 2 posters, think of the aesthetics (would you want to read this poster? Is it inviting?); organization (is each section clearly labelled, does the information flow?) information (can you get all the info you need to complete the chart? Is there any additional info that was surprising (fun fact)?) Scientist a. Yea r b. Belief/ philosophy 1.Democritu s BC All the matter in the universe is composed of tiny. These are indivisible 2.Dalton 1808 Element cannot be broken down by ordinary chemical means. Theory: 1. Atoms of a given element are identical in properties 2. Atoms cannot be subdivided, created/ destroyed. 3. Atoms of dif elements c. Experiment NONE Based on advances in analytical instruments (e.g. balance) d. Discovery/ contributio n Coined term atomos - indivisible conservation of mass. definite proportions multiple proportions e. Model N/A Cannonbal l

combine in whole # ratios to form compounds. 4. In chemical reactions, atoms are combined, separated or rearranged 3.Thomson 1897 Dalton s Laws and 4.Rutherford 1911 Thomson s alpha should pass easily through w/ minor deflection from the positive charges spread out in the gold atoms 5.Bohr 1913 Rutherford s Model Cathode ray ray can be deflected by applying a positively charged electric field Gold foil experiment narrow beam of alpha used to it a thin sheet of gold foil. Line Spectral analysis (chocolate chip where chips would be his electrons and the cookie is the positive matter to cancel out the negative electrons) Small dense positively charged nucleus with mostly EMPTY SPACE are found in orbitals Plumpudding Nuclear Planetary 6.Modern/ electron cloud Today move in waves and as individual Pauli, Planck, Heisenberg, Schroedinge r etc. Orbitalsmost likely location to find electrons Wavemechanica l 3) After you return to your seat and discuss with your group, label each below to reflect the scientist and name of.

_Dalton Thomson Rutherford Bohr modern_ cannonball plum pudding_ nuclear_ planetary wave-mechanical

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