The History of the Atom.

Slides:

Advertisements

Similar presentations

History at a Glance Atoms.

Advertisements

History of Atomic Structure

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

A History of the Atom A long time to study a little thing.

Atomic Theory Development

Early Greeks to Present

Atomic Theory “History of. . . ”.

Ancient Greece Democritus: .

The History of the Atom.

Atoms: Development of the Atomic Theory

Atomic Theory and the Atom

Atomic Structure Timeline

Development of the Atomic Theory

Atoms: Development of the Atomic Theory

Atoms Mr. Skirbst Physical Science Topic 13. Atomic Models.

The History of Atomic Theory

9/10/12 Atom and the History of the Atom

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

History of Atomic Theory

Atoms: Development of the Atomic Theory

The Atomic Model Chem 9.

+ ATOMIC THEORY. + Democritus Atom Democritus is an Ancient Greek philosopher born in Abdera, Thrace, Greece He was said to be the first step toward the.

History of Atomic Structure

Atomic Structure Timeline Read Around the Room. Democritus (400 B.C.) Proposed that matter was composed of tiny indivisible particles Not based on experimental.

What are important discoveries related to the structure of an atom?

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

History Behind the Atomic Theory

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

Chapter 4.1 – The Development of Atomic Theory 1.Democritus – - Greek philosopher, 4 th century BCE - suggested universe was made of indivisible units.

Atomic Structure.

Atomic Structure History and Theories. The Greeks 4 th century B.C. Democritus “Atomists” school of thought Matter is composed of tiny indivisible particles.

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.

Chapter 4: Atomic Structure

NOTES – Introduction to Atomic Theory ( )

Discovery of the Atom. Democritus  Democritus was an ancient Greek who had a philosophical idea of an atom.  His approach was not based on the scientific.

Atomic Structure. Way Early Theories Democritus ( BC) –First person to propose that matter is not infinitely divisible –Atomos –Matter is empty.

Atomic Theory “History of... ”. The Ancient Greeks Democritus and other Ancient Greeks were the first to describe the atom around 400 B.C. The atom was.

HISTORY OF THE ATOM. Aristotle 400 BC 400 BC - Claimed that there was no smallest part of matter - Claimed that there was no smallest part of matter -

What is an atom??? An atom is the smallest particle of an element that retains its identity in a chemical reaction.

Back ©Bires, 2002 Slide – The Discovery of Atomic Structure AP Chemistry Summer Work Chapter 2 Anyone who says that they can contemplate quantum.

Atomic Model History.

Development of the Atomic Theory

Slide 1 of 18 © Copyright Pearson Prentice Hall Defining the Atom > Atomic Structure Chapter 4 Video 3.

1 The Atom, in a nutshell…. 2 Democritus (c. 460—370 BC) Greek philosopher  The name atom was his idea  Proposed matter is made up of small particles.

History of the Atom. What do you know about the atom? Put simply, the atom is the smallest particle of pure essence. For example, helium gas is made up.

History of Atomic Structure. Ancient Philosophy Who: Aristotle, Democritus When: More than 2000 years ago (400 B.C.) Where: Greece What: Aristotle believed.

Development of the Atomic Theory. Democritus 460 BC - Greek philosopher proposes the existence of the atom ; calls it Atomos meaning indivisible. His.

STRUCTURE OF AN ATOM.

Do Now: Solve the following using the correct number of significant figures. 1)7.76 m m = 2)5.750 cg cg = 3)5555 kg kg = 4)1.23 m x 3.2.

Do Now: 1.On the blank side of an index card, draw a picture of an atom. 2.On the other side of the index card, write down things that you know about atoms.

DEVELOPMENT OF THE ATOMIC THEORY ATOMS. 460 BC - Greek philosopher proposes the existence of the atom He pounded materials until he made them into smaller.

Development of the Atom Chapter JOHN DALTON All matter is composed of atoms All atoms of a given element are identical Atoms of specific elements.

Scientists of Atomic Theory Unit 2 Democritus 460 B.C B.C. This Greek philosopher was among the first to suggest the existence of atoms. Democritus.

A Brief History of the Atomic Theory. 460 B.C. : Democritus Greek Philosopher Proposed that matter cannot be broken down indefinitely At some point you.

1.3 Early Models of the Atom pp Ancient Models of the Atom Democritus: he stated that there must be a smallest particle, which he called an.

Atomic Theory Democritus to Rutherford. Democritus - Ancient Greece w Philosophical question: Could matter be divided into smaller and smaller pieces.

The History of Atoms Not the history of the atom itself, but the history of the idea of the atom.

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.

5.1 Developing the Atomic Theory pp Learning Goals: Know who the key atomic theorists are & what their contribution was Know the model of.

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

ATOMIC THEORY. WHAT IS AN ATOM? What makes the elements on the Periodic Table different from each other? What is the name for the center of an atom? What.

I. Atomic History A.Democritus ( BC) 1.Ancient Greek philosopher 2.Proposed matter was made of tiny indivisible particles 3.He called them atoms.

Atomic Theorists and their Contributions

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

S. Aldrich HISTORY OF THE ATOM 460 BCE Democritus develops the idea of atoms He believed that you could cut objects in half, over and over again,

Atomic Theory Mr. Tollefson Chemistry Class. Introduction Students will be introduced to the atom and the development of the atomic theory from ancient.

The History of Atomic Theory

Atomic Structure.

The History of the Atom.

Presentation transcript:

The History of the Atom

Democritus (c.460-c.370 BCE) Democritus was a philosopher in ancient Greece. He thought that all matter was made of tiny particles that could not be divided. The Greek word atomos means ‘indivisible’.

John Dalton (1766-1844) Dalton was an English scientist. He developed modern atomic theory. His model of the atom is sometimes called the ‘billiard-ball model’.

Dalton’s Billiard-Ball Model All matter is made of tiny particles called atoms. Atoms of the same element are identical. Atoms can combine to form compounds. Chemical reactions change the grouping of atoms, but not the atoms themselves.

Sir J. J. Thomson (1856-1940) Thomson was a British physicist. He did experiments on cathode rays and discovered the electron. In 1906, he was awarded a Nobel prize for his discovery. His model of the atom is called the ‘plum-pudding model’.

Thomson’s Plum-Pudding Model Dalton realised that negatively charged electrons could come from an atom. He proposed the ‘plum-pudding’ model of the atom, suggesting that atoms consist of negatively-charged electrons in a ‘sea’ of positive charge.

Ernest Rutherford (1871-1937) Rutherford was a chemist from Nelson, New Zealand. Based on the results of his gold-foil experiment, he proposed that most of the mass of an atom is concentrated in a central nucleus. He won the Nobel Prize in Chemistry in 1908 for his work.

Rutherford’s Gold-Foil Experiment In his famous gold-foil experiment, Rutherford fired alpha particles at a thin sheet of gold foil. He found that some particles were deflected through large angles, and some even bounced back.

Rutherford’s Nuclear Model Rutherford concluded that: most of the mass in an atom must be in a very small, positively-charged nucleus in the centre of the atom electrons spin around this central nucleus there was a basic unit of positive charge in the nucleus, called the proton.

Niels Bohr (1885-1962) realised that the electrons could only occupy fixed orbits around the nucleus. Louis de Broglie (1892-1987) proposed that electrons can be regarded as waves, resulting in an ‘electron cloud’ around the nucleus. Sir James Chadwick (1891-1974) discovered the neutron, a nuclear particle with similar mass to a proton but no electrical charge.

References Atom Image: http://www.turbosquid.com/FullPreview/Index.cfm/ID/197928 Democritus: http://smccd.net/accounts/goth/MainPages/Chron/Democritus.jpeg Dalton: http://en.wikipedia.org/wiki/John_Dalton Thomson: http://en.wikipedia.org/wiki/J_J_Thomson Plum-Pudding Atom: https://reich-chemistry.wikispaces.com/file/view/348px-Plum_pudding_atom_svg.png Ernest Rutherford: http://en.wikipedia.org/wiki/Earnest_Rutherford http://nobelprize.org/nobel_prizes/chemistry/laureates/1908/rutherford-bio.html Gold-Foil Experiment: http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter02/Text_Images/FG02_05.JPG Nuclear Atom: http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Stylised_Lithium_Atom.svg/180px-Stylised_Lithium_Atom.svg.png Electron Cloud: http://www.csmate.colostate.edu/cltw/cohortpages/viney_old1/atom.jpg