History of Atomic Structure

Slides:

Advertisements

Similar presentations

Early Atomic Theory and the Structure of the Atom

Advertisements

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

Defining the Atom All matter is composed of atoms

Chapter 4 Atomic Structure

Atomic Theory “History of. . . ”.

Atomic Theorists How we got to where we are now. Law of Conservation of Mass Matter can’t be created or destroyed Who: Antoine Lavoisier When: 1785 Where:

Democritus: The Atom (around 400 BCE)

The History of the Atom.

Atomic Theory and the Atom

 Warm-Up: Atom Probe  Classwork: Atom notes; Create a Timeline  Homework: The Atoms Family Album (Glue In)

History of Atomic Structure. Ancient Philosophy Who: Aristotle, Democritus When: More than 2000 years ago Where: Greece What: Aristotle believed in 4.

History of Atomic Theory

A Pictorial History of Atomic Theory

Chapter 4: Glow in the Dark

The Atomic Model Chem 9.

History of Atomic Structure. Ancient Philosophy Who: Aristotle, Democritus When: More than 2000 years ago Where: Greece What: Aristotle believed in 4.

Development of our understanding of the atom. Early Models Democritus was first to suggest atom in 4 th century B.C. Believed matter was made of tiny.

History of Atomic Theory

History of Atomic Structure

Atom Models From Democritus to Bohr’s.

Unit: Atomic Structure

PART ONE ATOMIC THEORY. Over the course of thousands of years our idea of what matter is made of and what the atom looks like has changed dramatically.

The Development of the Atomic Theory

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

Chapter 4: Atomic Structure

Atomic Theory: the beginning Chapter 3 Part I. Democritus An Ancient Greek Theorized about the existence of atoms. Did not use Scientific Method.

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

Atomic Theory: A Timeline More than 2000 years ago ancient philosophers had theories on matter BC - Democritus believed that matter was made of.

Section 1- Discovering the parts of the atom

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.

Development of Atomic Structure How long have people been interested in understanding matter and its structure? A.Thousands of years B.Hundreds of years.

History of Atomic Theory

History of Atomic Structure. Ancient Philosophy Who: Aristotle, Democritus When: More than 2000 years ago Where: Greece What: Aristotle believed in 4.

How long have people been interested in understanding matter and its structure? Thousands of years Hundreds of years A few years Never.

Atomic Structure. 1. Democritus: Around 300 BC, a Greek philosopher, Democritus stated that everything is made up of tiny, invisible particles He said.

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

History of Atom Flip Book

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

History of Atomic Structure. Ancient Philosophy Who: Aristotle, Democritus When: More than 2000 years ago Where: Greece What: Aristotle believed in 4.

History of Atomic Structure. Ancient Philosophy Who: Aristotle, Democritus When: More than 2000 years ago Where: Greece What: Aristotle believed in 4.

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.

BY Dhruv Rana, Miguel Rivas, Cristian Tapia.  More than 2000 years ago  Were from Greece  Aristole believed in four elements: Earth, Water, Wind, Fire.

Law of Conservation of Mass Who: Antoine Lavoisier Matter can't be created or destroyed When: 1785 Where: France.

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.

By: Jeremy Aponte, Javier Candelaria, Eric Mendoza.

The Development of a Modern Theory of the Atom Aristotle Democritus.

History of Atomic Structure. How long have people been interested in understanding matter and its structure? A.Thousands of years B.Hundreds of years.

History of the atom: History of the atom: Changing atomic models.

How long have people been interested in understanding matter and its structure? A.Thousands of years B.Hundreds of years C.A few years D.Never.

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.

The History of the Atom.

History of Atomic Structure. Aristotle Democritus.

Bellwork10/12/06 How long have people been interested in understanding matter and its structure? A.Thousands of years B.Hundreds of years C.A few years.

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.

Bellwork08/20/2012 How long have people been interested in understanding matter and its structure? A.Thousands of years B.Hundreds of years C.A few years.

ATOMS!. Early models of the atom The existence of the atom was first proposed by Democritus of Abdera who lived in Greece during the 4th century B.C.

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

Smallest particle of an element that retains the properties of the element.

History of the Atomic Theory An atom is the smallest particle of an element that retains its identity in a chemical reaction. Our current theory of the.

The History of Atomic Theory

Bellwork 10/12/06 How long have people been interested in understanding matter and its structure? Thousands of years Hundreds of years A few years Never.

History of Atomic Structure

History of Atomic Structure

Early Atomic Theories and the Origins of Quantum Theory 3.1 and 3.2

Development of Atomic Structure

Atomic Structure.

Development of Atomic Structure

Bell work Challenge Winning Group Will Earn +10 Test Points

Presentation transcript:

History of Atomic Structure

Democritus Aristotle

Ancient Philosophy Who: Aristotle, Democritus When: More than 2000 years ago 460 BC Where: Greece What: Aristotle believed in 4 elements: Earth, Air, Fire, and Water. Democritus believed that matter was made of small particles he named “atoms”. Why: Aristotle and Democritus used observation and inference to explain the existence of everything.

Any experimental support for ideas?

Alchemists Who: European Scientists When: 800 – 900 years ago Where: Europe What: Their work developed into what is now modern chemistry. Why: Trying to change ordinary materials into gold.

Alchemic Symbols

John Dalton

Particle Theory Who: John Dalton When: 1766-1844 Where: England, school teacher What: Described atoms as tiny particles that could not be divided. Thought each element was made of its own kind of atom. Why: Building on the ideas of Democritus in ancient Greece.

Does this part hold true today? 4 Part Atomic Theory 1. Elements are composed of tiny indivisible particles (atoms). Does this part hold true today?

Does this part hold true today? 2. Atoms of the same element are identical and different from other atoms. Does this part hold true today?

Does this part hold true today? 3. Atoms can physically mix and chemically combine in whole number ratios. Does this part hold true today?

Does this part hold true today? In chemical reactions, atoms separate, join and rearrange. Atoms cannot be changed into other atoms. Does this part hold true today?

Did Dalton have experimental support for his theory?

Dalton’s Solid Sphere Model of the Atom

Discovery of Electrons Who: J. J. Thompson When: 1897 Where: England, physicist What: Thompson discovered that electrons were smaller particles of an atom and were negatively charged. Why: Thompson knew atoms were neutrally charged, but couldn’t find the positive particle.

J. J. Thompson

Thomson’s Cathode Ray Tube

Thomson’s Plum Pudding Model of the Atom

Who: Robert Milliken When: 1868-1953 Where: United States, physicist What: Conducted an experiment to determine the quantity of charge on an electron, 1-, in his famous oil drop experiment Why: He knew that atoms had electrons, wanted to determine charge

Robert Milliken

Atomic Structure I Who: Eugene Goldstein When: 1850-1930 Where: England What: Conducted an experiment with a cathode-ray tube and found rays traveling in the direction opposite to that of the cathode rays. He concluded that they were composed of positive particles- protons. Why: He concluded that they were composed of positive particles- protons

Atomic Structure I Who: Ernest Rutherford When: 1911 Where: England What: Conducted an experiment to isolate the positive particles in an atom. Decided that the atoms were mostly empty space, but had a dense central core. Why: He knew that atoms had positive and negative particles, but could not decide how they were arranged.

Ernest Rutherford

Who: James Chadwick When: 1932 Where: England, physicist What: confirmed existence of the neutron Neutrons have no charge and have a mass nearly equal to that of a proton

Atomic Structure II Who: Niels Bohr When: 1913 Where: England What: Proposed that electrons traveled in fixed paths around the nucleus. Scientists still use the Bohr model to show the number of electrons in each orbit around the nucleus. Why: Bohr was trying to show why the negative electrons were not sucked into the nucleus of the atom.

Niels Bohr

Electron Cloud Model Electrons travel around the nucleus in random orbits. Scientists cannot predict where they will be at any given moment. Electrons travel so fast, they appear to form a “cloud” around the nucleus.

Electron Cloud Model