History of the Atomic Theory

Unit 3: Atoms

Day 1: Do Now/Big Question

In your science notebook:How do you think scientists

discovered the nucleus of an atom?

AFTER TODAY I WILL BE ABLE TO:•List the main points of Dalton’s atomic theory. •Explain how Thomson and Rutherford produced their atomic models.

EVERYTHING IN PURPLE OR THAT HAS A PURPLE ARROW NEEDS TO BE IN YOUR NOTEBOOK!

ANNOUNCEMENTS

You need a notebook by today! (5 points)

Add “Jessica Racine-Teacher” on Facebook by the end of the week (5 points)

Remind your parents that conferences are next Monday and Tuesday

Day 2: DO NOW

Who discovered electrons?

Test Averages

Period 1: 34.6% Period 2: 56.5% Period 3: 43.6% Period 4: 42.2% Period 6: 34%

Highest grade: 96% What they did to study: reviewed all

PowerPoints

Today’s Objectives

AFTER TODAY I WILL BE ABLE TO:List the main points of Dalton’s atomic theory and describe his evidence that atoms exist.

Explain how Thomson and Rutherford used data from experiments to produce their atomic models.

WRITE ALL OF THIS IN YOUR NOTEBOOK

THREE GUYS OF TODAY

1. DALTON

2. THOMSON

3. RUTHERFORD

I. Theory 1: DALTON

A. Three findings1. “all atoms of a given element are exactly alike”

a. this means: atoms of one element are the same

I. Theory 1: DALTON

A. Three findings2. Compounds are _______ or more ____________ _________ ____________.

A. Three findings2. Compounds are two or more elements chemically combined

I. Theory 1: DALTON

A. Three findings3. Atoms cannot be divided

I. Theory 1: DALTON

B. Dalton’s ModelRECAP:1.Atoms of the

same element were identical

2.Atoms join to form compounds

3.Atoms cannot be divided

II. Theory 2: Thomson

A. His experiment 1. (Describe it in your own

words……)

2. Thompson discovered __________ by using the cathode ray

ELECTRONS!

II. Theory 2: Thomson

B. His model1. PLUM PUDDING2.

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3. A blueberry muffin is similar to Thompson’s model because…

III. Theory 3: Rutherford

A. Rutherford’s experiment1. Describe it: ***VIDEO

Rutherford shot positive charged particles at gold foil. Most went through, some deflected, and some came completely straight backwards2. Draw it:

III. Theory 3: Rutherford

A. Rutherford’s experiment3. This proved….

that parts of atoms had a concentrated positive charge in the center

a. nucleus: small center of atom that has positive charge

i. If the nucleus was a marble, the atom would be the size of a football field

III. Theory 3: Rutherford

B. Rutherford’s model1. Draw it:

electrons

nucleus

YOUR GROUP ASSIGNMENT

Your group will be assigned a scientist

You must think of a creative way to explain what they did

You have 7 minutes to come up with an idea

You have ____ minutes to plan and 4 minutes to present

ASSIGNMENT RUBERIC

Graded on: Points:

Name of scientist 1Explain experiment 5*Explain findings 2Draw and explain model 3Creativity 5Productivity 4

* Dalton group: see me

IV. Compare and Contrast

SCIENTIST

YEAR FINDINGS

MODEL

1808

1897

1898

SCIENTIST

YEAR FINDINGS

MODEL

DALTON 1808 1. Identical atoms

2. Atoms cannot be divided

3. Compounds

THOMPSON 1897 Electrons exist

RUTHERFORD

1898 Nucleus is positive in the center of an atom

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EXIT TICKET 1: 10 minutesAnswer questions 1-3

Clear everything off of your desk

THIS IS YOUR OWN WORK!

Answer in complete sentences

Pencil down when you are done

Answer the Big Question

How did scientists discover the nucleus?

Assignments: HOMEWORK 1, add me on facebook, return test

SCIENCE FAIR TOPIC BY MONDAYDue when I see you next