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

Slides:

Advertisements

Similar presentations

History at a Glance Atoms.

Advertisements

The History of Atomic Theory

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

 What is an atom?  Draw a picture to go with your explanation.

ATOMIC STRUCTURE AND HISTORY

Democritus: The Atom (around 400 BCE)

Democritus (460 BC-350BC) was a Greek philosopher who thought that all matter was made of tiny indivisible particles he called atomos.

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

The History of Atomic Theory

Atomic Structure.

History of the Atomic Theory

History of Atomic Theory 1

The History of Atomic Theory

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

The History of Atomic Theory

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.

Investigating Atoms and Atomic Theory

History of Atomic Structure

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

Atom Models From Democritus to Bohr’s.

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

The History of the Atom.

The Development of the Atomic Theory

History Behind the Atomic Theory

Atomic Models. JOHN DALTON Early 1800’s Thought atoms were smooth, hard balls that could not be broken into smaller pieces. All elements are made of atoms.

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

EARLY Atomic theories.

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.

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

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

The Development of Modern Atomic Theory Viewing the Invisible V. Anderson 2005—Mergenthaler Voc. Tech. High School.

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

Atomic Model History.

Chapter 4 Atomic Structure.

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 Where: Greece What: Aristotle believed in 4.

Atomic Models This model of the atom may look familiar to you. This is the Bohr model. In this model, the nucleus is orbited by electrons, which are in.

The Development of Modern Atomic Theory

Studying Atoms 4.1 Seeing the Invisible The Big Debate Can matter be divided into smaller and smaller pieces forever? YES! NO! AristotleDemocritus.

Unit 10: Atoms and Periodicity. An atom is the smallest particle in which matter can be divided and still be the same substance. The same type of atoms.

Atom : The smallest particle of an element that keeps all the properties of that element. Lesson: Old Dead Guys.

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

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 Atomic Theory Democritus Dalton 440 B.C. – Thought matter was made of tiny particles – Believed these particles could not be cut into anything smaller.

Atomic Theories: How do we know what atoms are made of?

O We use models to help us understand things that are too: BIG small Fast s l o w or complicated to see in “real life”

Chapter 11 Introduction to Atoms. Section 1: Objectives  Describe some of the experiments that led to the current atomic theory.  Compare the different.

History of Atoms By: Layan Suleiman 7A.

The History of the Atom.

The Changing Model of the Atom

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

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?

4.1 Studying Atoms The philosopher Democritus believed that all matter consisted of extremely small particles that could not be divided. He called these.

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

The Atom - Scientists. Philosophers Democritus – believed matter was not infinitely divisible THERE WERE NO EXPERIMENTS TO TEST HIS IDEAS Matter is composed.

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

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.

Who are these men?.

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 Structure Section 4-1. Democritus Greek philosopher 4 th Century BC First to come up with “atom”. Matter is composed of tiny particles called atoms.

DEVELOPMENT OF THE ATOMIC THEORY Atom- smallest particle into which an element can be divided and still be the same substance Called the building blocks.

The Changing Model of the Atom. Aristotle 400 BCE claimed that there was no smallest part of matter different substances were made up of different proportions.

Atomic Structure.

The History of the Atom.

Presentation transcript:

Atomic Theory Democritus to Rutherford

Democritus - Ancient Greece w Philosophical question: Could matter be divided into smaller and smaller pieces infinitely? w Democritus thought that everything in the universe was made of tiny particles called “atomos” (atoms) w “atomos” means indivisible, not to be cut w Democritus was a philosopher, not a scientist. w He never tested his theory

John Dalton ( ) We might as well attempt to introduce a new planet into the solar system, or to annihilate one already in existence, as to create or destroy a particle of hydrogen

w Matter is made up of atoms w Atoms are indestructible They cannot be created or destroyed w Atoms of an element are identical and have same mass* w Atoms of different elements have different mass w Compounds are formed by combining atoms Dalton’s Atomic Theory

JJ Thomson’s work w studied electricity w knew that: atoms were neutral negative charges from his electric stream w charged particles from individual atoms w termed the particle “electron” w model had positive material to balance the negative electrons

Ernest Rutherford w devised a method to test Thomson’s atomic model w Passed alpha particles (positive charged particles) through a piece of gold foil. w He predicted the alpha particles would pass straight through. w 1 in every bounced straight back. Some deflected at an angle.

Early Theory Summary w Democritus: named “atom” w Dalton : atomic theory w J J Thomson : “plum pudding” model, termed “electron” w Ernest Rutherford : atom with a positive nucleus surrounded by orbiting electrons