Atoms and Their Structure Early Greek Theories 400 B.C. - Democritus crushed substances in400 B.C. - Democritus crushed substances in his mortar and.

Slides:

Advertisements

Similar presentations

The Early Models of the Atom

Advertisements

Atoms and their structure

Atoms, Molecules, and Ions

History of the Atom.

Democritus Dalton 3. JJ Thomson 4. Rutherford 5. Bohr 6. Chadwick

Atomic Theories.

Models of the Atom a Historical Perspective

The History of Atomic Theory A piece by piece progression through the structure of the atom.

History of the Atomic Model

Ancient Greece Democritus: .

Models of the Atom a Historical Perspective Aristotle Early Greek Theories 400 B.C. - Democritus thought matter could not be divided indefinitely. 350.

 You cannot see them, yet they make up everything…

The History of Atomic Theory

Development of the Atomic Theory

History of Atomic Theory

History of Atomic Theory 1

The History of Atomic Theory

AIM: Models of the Atom DO NOW:

The History of Atomic Theory

The History of Atomic Theory

Chapter 4 Atoms and their structure History of the atom n Not the history of atom, but the idea of the atom. n Original idea Ancient Greece (400 B.C.)

Atomic Structure and The Periodic Table

11 Atomic Theory. 2 A HISTORY OF THE STRUCTURE OF THE ATOM.

Atomic Structure History of Atomic Theory. Democritus ( BC) Was the first person to come up with the idea of atom Believed that all matter was.

Evolution of the ATOM Project

The Atomic Model Chem 9.

History of Atomic Theory

Atomic Theory-Democritus

Chapter 4: Discovery of Atomic Structure. Prentice Hall © 2003Chapter 2 The Discovery of Atomic Structure An ancient Greek named Democritus was the first.

History of Atomic Theories Dr. Chin Chu River Dell Regional High School.

Chapter 4 Atoms and Their Structure History of the atom n Not the history of atom, but the idea of the atom n Original idea Ancient Greece (400 B.C..)

TITLE The Development of Atomic Theory. Early Ideas Democritus—Greece 400 B.C. His idea:  There was a limit to how far you could divide matter. You would.

Models of the Atom: A Historical perspective

Chapter 4: Atomic Structure

Models of the Atom a Historical Perspective

Models of the Atom a Historical Perspective Aristotle Early Greek Theories 400 B.C. - Democritus thought matter could not be divided indefinitely. 350.

Developing a Model of the Atom The History of Atomic Theory.

History of Atomic Structure Atoms: their parts & pieces.

Chapter 4 Atoms and their structure History of the atom n Not the history of atom, but the idea of the atom n Original idea Ancient Greece (400 B.C..)

Part I. Leucippus and Democritus (460 to 370 BC) – believed that all matter was made up of tiny particles called atoms. Aristotle (384 to 322 BC) – believed.

Introduction to Atomic Structure Chemistry Chemistry is the study of matter and the changes it undergoes. The type of matter that is changing and what.

The Atom Chapter 4.

Ch.4 Atomic Structure How do we know atoms exist? Picture, in your mind, what you think an atom looks like.

Atomic Theory 15,000 kilotons.  Dismissed idea of the atom. Early Greeks Two schools of thought:  Matter is made of indestructible particles called.

Models of the Atom a Historical Perspective simple atom structure atomic history song.

What is an _________? The smallest particle of an ________ that is still an ________ _________ are the building blocks of all ___________.

Investigating Atoms and Atomic Theory Describe the particle theory of matter. Describe the particle theory of matter. Use the Bohr model to differentiate.

History of the Atom Democritus Democritus: It was 400 BC when he came up with the idea that matter could not be divided indefinitely. This lead to the.

Atoms and their structure Labs n Labs are now online is a Google Docs folder n You can view the lab if you lose it (and you can copy and paste the procedure.

EARLY MODELS OF THE ATOM Models of Matter A model is a tentative description of a system or theory that accounts for all of its known properties Models.

History of Atomic Structure Atoms and their parts.

Democritus This is the Greek philosopher Democritus who began the search for a description of matter more than 2400 years ago. This is the Greek philosopher.

The Atom Unit 3, Presentation 1. History of the atom Not the history of atom, but the idea of the atom – The atom was not “discovered” until recently.

MODERN CHEMISTRY CH 3 Atoms: The Building Blocks of Matter.

Models of the Atom a Historical Perspective

Chapter 3 Atoms and their structure History of the atom n Original idea Ancient Greece (400 B.C.) n Democritus and Leucippus- Greek philosophers. n Aristotle.

Models of the Atom a Historical Perspective

Brief History of Atomic Theory. 1 st atomic models In 400 BC, the model looked like a solid indivisible ball In 400 BC, the model looked like a solid.

The History of the Atom. Aristotle  Aristotle was the first scientist that we have record of questioning what stuff was made of.  What did he think?

Historical Development of an Atom. Democritus B.C Democritus was a Greek philosopher ( B.C.) who is the father of modern atomic thought.

Atomos: Not to Be Cut The History of Atomic Theory.

Who are these men?.

Can you match the scientists’ names to their pictures? Democritus Dalton JJ Thomson Rutherford Bohr De Broglie Schrodinger.

Atomic Theorists The ‘Who’s Who’ of the atomic world.

Chapter 3 Atoms and their structure History of the atom n Democritus, a Greek philosopher, originally came up with the idea of an atom (around 400 BC)

AIM: Models of the Atom DO NOW: Element Y has two isotopes: Y-27 and Y-29. Y-27 has an abundance of 43% and Y-29 has an abundance of 57%. What is the average.

Models of the Atom a Historical Perspective

Models of the Atom a Historical Perspective

Presentation transcript:

Atoms and Their Structure

Early Greek Theories 400 B.C. - Democritus crushed substances in400 B.C. - Democritus crushed substances in his mortar and pestle his mortar and pestle There eventually came a point where he couldThere eventually came a point where he could not crush the substance anymore (still kept its integrity)not crush the substance anymore (still kept its integrity) This became know as the atom. (could not be divided)This became know as the atom. (could not be divided) Name atomos - indivisible Democritus

Democritus’ Model solid indestructible sphere

John Dalton n Dalton proposed a modern atomic model based on experimentation not on pure reason. All matter is made of atoms. Atoms of an element are identical. Each element has different atoms. Atoms of different elements combine in constant ratios to form compounds. Atoms are rearranged in reactions. His ideas account for the law of conservation of mass (atoms are neither created nor destroyed) and the law of constant composition (elements combine in fixed ratios).

++ Carbon, C Oxygen, O Carbon Monoxide, CO Carbon Monoxide, CO Mass 12.0 Mass 16.0 Mass Mass 16.0

++ == CarbonOxygen Carbon Monoxide, 1:1 == Carbon Dioxide, 1:2 ++ CarbonOxygen Law of Constant Composition

John Dalton’s Model solid indestructible sphere

Parts of Atoms n J. J. Thomson - English physicist n Used a piece of equipment called a cathode ray tube.

Thomson’s Experiment Voltage Source +- Metal Disks

n Passing an electric current makes a beam appear to move from the negative to the positive end Thomson’s Experiment Voltage Source +-

Thomson’s Experiment n By adding an electric field he found that the moving pieces were negative + -

Thomson’s Model n Found the electron. n Said the atom was like plum pudding. n The atom is a sphere with a positive charge, where negatively charged pieces are embedded

Rutherford’s Experiment n Ernest Rutherford English physicist. (1910) n Used Alpha particles - (He atom, positively charged) n Shot them at gold foil which can be made a few atoms thick.

Lead block Uranium Gold Foil Flourescent Screen

He Expected n The alpha particles to pass through. n Because… n The positive charges were spread out evenly. (atom is neutral)

He Expected

What he got……

+ What he got…..

Rutherford’s Model n Atom is mostly empty. n Small dense, positive piece at center.

Bohr Model n Electrons move in definite orbits around the nucleus, (like planets circle the sun) n These orbits, or energy levels, are located at certain distances from the nucleus. n Energy separates one level from another.

Nucleus Electron Orbit Bohr’s Model

Modern View / Wave Model n Nucleus- protons and neutrons. n Electron cloud- region where you ‘might’ find an electron.

The Wave Model n It is impossible to determine the exact location of an electron. The probable location of an electron is based on how much energy the electron has.

The Wave Model