9/03/13

Practice:

1. Atom

2.Electron CloudExit:

Starter:

Match on next slide

Atomic Theory

9/03/13Atomic TheoryApplication:

Fold and Glue notes here when done

Protons Neutrons Electrons Distinct Nucleus

Electron cloud

Bohr

Rutherford

Dalton

Thomson

Cloud model

Connection: Paste Chart Here

Pick an atomic theorist, If they were alive today, what would you ask them?

15 16

Match the equipment with its correct use

A. Apron

B. Fire Blanket

C. Goggles

D. Gloves

E. Eye Wash

1. Use when heat is present or harmful chemicals to the skin are being used

2. Use to flush your eyes if you get any glass and/or chemicals in your eye for at least 5 minutes

3. Always wear when dealing with harmful chemicals or hazardous materials

4. Use to smother a fire by throwing it over the fire and patting the fire out

5. Always wear when any chemicals, glass containers, or heat is being used

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4

5

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2

Agenda 1. Starter2. Practice3. Notes

4. Connection5.Exit

Date Lecture/ Activity/ Lab Page8/28/ Syllabus /Notebook Guidelines 1-28/28 Periodic Table/ Formula 3-48/28 Tools/ Measurement 5-68/28 Lab Report/ Investigations 7-88/28 Restroom passes/Homework Log 9-108/29 Safety equipment 11-128/30 Atoms Vocabulary 13-149/3 Atomic Theory Research notes 15-16

Table of Contents

Practice

Define:

1. Atom

2.Electron Cloud

Application: Atomic Theory

Exit

Year Scientist Theory Diagram

Democritus

Dalton

Thomson

Rutherford

Bohr

Lewis

Shrodinger

Chadwick

Present day

Draw this chart on your Notebook paper; will glue afterward

The History of the Atom

The Beginning of

the Atom

Early Models of the Atom

Democritus 460 BC- 370 BC

Universe was made of empty space and tiny bits of stuff Called these tiny bits of stuff atomosAtoms could not be divided

Early Models of the Atom Dalton

Early 1800’s

All elements are composed of indivisible particles. Atoms of the same element are the sameAtoms of different elements are different. Compounds consisted of atoms of different elements combined together

Dalton’s Model of the Atom

He believed the atom was a solid sphere

An analogy to his atom would be…

Early Models of the AtomThomson

1906Plum pudding modelAtom made of a positively charged material with the negatively charged electrons scattered through it.

An American analogy to his atom would be…

Plum Pudding is an English dish sort of like bread pudding with raisins in it.

…Is like…

But we’ll still refer to it as the “Plum Pudding” model in class

Early Models of the Atom Rutherford 1909

Mostly empty spaceSmall, positive nucleus Contained protonsNegative electrons scattered around the outside

Example of Rutherford’s Atom

Early Models of the Atom Bohr 1913

Electrons move in definite orbits around the nucleus

Lewis Dot Structure1916

Recognized that not all electrons in an atom play a role in chemical bondingThe outermost electrons of an atom, called the valence electrons are chemically important.

Erwin Shrodinger

1924 - Austrian physicist; developed the electron cloud model

Electron Cloud Model

Proposed by Erwin Schrodinger

Erwin Shrodinger

His Theory: The exact path of electrons cannot be

predicted.

The region referred to as the electron cloud, is an area where electrons can likely be found.

James Chadwick

1932 - English physicist; discovered neutrons

His Theory: Neutrons have no electrical charge. Neutrons have a mass nearly equal to

the mass of a proton. Unit of measurement for subatomic

particles is the atomic mass unit (amu).

Modern Model of the AtomThe electron cloud

1920’sSometimes called the wave modelSpherical cloud of varying density Varying density shows where an electron is more or less likely to be

Connection:Check which of these applies to

each Theorist

Protons Neutrons Electrons Distinct Nucleus

Electron cloud

Bohr

Rutherford

Dalton

Thomson

Cloud model

Exit

Pick an atomic theorist. If they were alive today, what would you ask them?