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

Slides:

Advertisements

Similar presentations

History of the Atom.

Advertisements

Chapter 4 Atomic Structure

ATOMIC STRUCTURE AND HISTORY

Atomic Theory “History of. . . ”.

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.

The History of Atomic Theory

AIM: Models of the Atom DO NOW:

The Complete Modern Atom

By: Amina Al-Naama 7D. An atom a fundamental piece of matter. Everything in the universe except energy is made of matter, and, so, everything in the universe.

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.

History of Atomic Theory

Chapter 4: Glow in the Dark

The Atomic Model Chem 9.

History of Atomic Structure

Atomic Theory-Democritus

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

Atom Models From Democritus to Bohr’s.

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.

NOTES – Introduction to Atomic Theory ( )

History of Atomic Structure Atoms: their parts & pieces.

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

The Changing Models of the Atom

Early Atomic Models Democritus –World is made of two things: empty space and indivisible particles, called atoms –There are different atoms for every material.

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

Atomic Model History.

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

The Atom Pg. 29. Early Theories There was no experimentation Democritus- atoms are solid, homogeneous, indestructible, and indivisible Aristotle- believed.

Chapter 4 Atomic Structure.

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 Atoms and their parts.

Beginning Man has always wanted to know, to understand how nature works. It is in his nature to ask questions and then to seek the answers. One such question.

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

Atomic Structure.

The History of Atomic Theory. Democritus Greek philosopher 2400 years ago The Atom Could matter be divided into smaller and smaller pieces forever? Or.

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”

The Atom. Dalton’s Atomic Theory 1.Elements are made of tiny particles called atoms. 2.All atoms of a given element are identical. 3.The atoms of a given.

Atomic Theories Chapter 4.1 How do we know about atoms when no one has ever seen inside an atom?

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.

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.

The Changing Model of the Atom

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

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.

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?

Atoms Family. The Atoms Family to the of Adams Family 1 st Verse They’re tiny and they’re teeny Much smaller than a beany They never can be seeny The.

Models of the Atom. Ancient Greece 300 BC in Greece School of thought that matter is made up of tiny indivisible, invisible, indestructible, fundamental.

+ ATOMIC THEORY. + Democritus Atom He was said to be the first step toward the current atomic theory. Hypothesized all matter is composed of tiny particles.

History of the Atom From Democritus to Bohr. Democritus of Abdera Greek 4 th century BC. Democritus is known as the "Laughing Philosopher“because of his.

THE STRUCTURE OF THE ATOM.  All atoms consist of 2 regions:  1) Nucleus: very small region located near the center of the atom  Proton: positively.

Ch 5: Atomic Structure. warmup All matter is composed of very small particles called atoms. In middle school science you learned about the atom. 1. Draw.

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

The Changing Model of the Atom From Democritus to Bohr.

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 Theory. English scientist John Dalton, suggested that matter was made up of elements An Element is a pure substance Each element is composed of.

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

Atomic Theory “History of. . . ”.

The History of Atomic Theory

Evolution of the atomic model

Theories of the Atom.

The Atoms Family.

Presentation transcript:

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

Early Ideas!! Early man, including the philosophers of Greece, believed that all matter was made of 4 basic “elements” – Earth – Water – Air – Fire

Ancient Philosophy about the Elements

New Ideas As time progressed, a number of individuals contributed to the idea of the modern atom.

Democritus Lived: ancient Greece Believed: “According to convention, there is a sweet and a bitter, a hot and a cold, and according to convention there is color. In truth there are atoms and a void.” Coined the term Atom

John Dalton Born: 1766, Cumberland, England Occupation: Teacher Believed: “We might as well attempt to introduce a new planet into the solar system, or annihilate one already in existence, as to create or destroy a particle of Hydrogen.” --J. Dalton, A New System of Chemical Philosophy, 1808

John Dalton’s Particle Theory

Key Points of Dalton’s Atomic Theory Dalton's atomic theory rests on the following postulates.  All matter consists of tiny particles.(atoms)  Atoms are indestructible and unchangeable.  Elements are characterized by the mass of their atoms. All atoms of the same element are identical and different from atoms of other elements.

JJ Thomson Born: 1856 Place: Manchester, England Discovered Electrons Plum pudding Model – A unit made of multiple pieces

Plum Pudding Model “I see the atom as being made of electricity. I call my picture the “plum pudding” model of an atom. Note that in this model negatively charged particle called electrons(the plums) are embedded in a sphere of positive charge(the pudding).”

J.J. Thomson Discovers the Electron

Thomson’s Experiment Thomson used a Vacuum tube (Cathode Ray Tube) to demonstrate that the produced ray was made of charged particles. The ray that was produced in the tube would bend toward a Positive Magnet and away from a Negative magnet, proving that the particles were Negatively charged. – ELECTRONS!!!!

Thomson’s Experiment - Diagram

Cathode Ray Tube It may seem mundane and boring to us today, but to audiences at popular scientific lectures, the glow in this simple cathode tube was eerie, and to physicists it presented a challenging mystery.

Ernest Rutherford’s Atom “I suggest that the atom has the following characteristics:” A small core, or nucleus, that contains most of the mass of the atom. The nucleus is made of particles called protons The protons are surrounded by negatively charged electrons, but most of the atom is actually empty space.

Ernest Rutherford and the Structure of the Atom

Rutherford’s observations Most particles passed through the gold foil without any effect. A few particles passed through but were deflected to the side. A few particles bounced back toward the source He described these “bouncers” as cannon balls deflected by tissue paper.

Neils Bohr 1913 Neils Bohr, a Danish scientists, developed a theory: – Electrons travel around the nucleus in orbits like those of the planets around the sun – “The Bohr Model”

Neils Bohr’s Atomic Model

Development of the Modern Atomic Theory Solid particle Electrons In planetary Orbit around Nucleus Surrounded by A cloud of electrons In energy levels

The “Atoms Family”

They’re Tiny and they’re teeny Much smaller than a beany They never can be seeny The Atoms Family

Together they make gases And liquids like molasses And all the solid masses The Atoms Family

They are so small (snap snap) They’re round like a ball (snap snap) They make up the air They’re everywhere Can’t see them at all (snap snap)

The neutrons can be found Where protons hang around Electrons they surround The Atoms Family

The Real Addams Family