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.

Slides:

Advertisements

Similar presentations

4-1: Introduction to Atoms

Advertisements

Atomic Structure Topic 3.

Democritus: The Atom (around 400 BCE)

Atoms: Development of the Atomic Theory

Atomic Structure.

Inside the Atom.

Powers of 10 What is the smallest unit of matter? Can we see atoms?

Atoms: Development of the Atomic Theory

Matter Anything that has mass and takes up space. Anything that has mass and takes up space. All matter can be measured All matter can be measured Mass.

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

History of Atomic Theories

A Pictorial History of Atomic Theory

Atoms: Development of the Atomic Theory

Evolution of the ATOM Project

The Atomic Model Chem 9.

History of Atomic Structure

Atom Models From Democritus to Bohr’s.

The Atomic Theory. The Atom Protons and Neutrons.

OHHHHH YEAHHHHH.  400 BC Greece-philosophers  Democritus said that there must be something that cannot be divided  He called this particle atomos 

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.

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.

Matter & The Atom. Matter The term matter describes all of the physical substances around us Matter is anything that has mass and takes up space The Universe.

Chapter 4: Atomic Structure

Matter & The Atom. Matter  The term matter describes all of the physical substances around us  Anything that has mass and volume (takes up space) 

Atomic Theory. Name the scientist whose atom looked like this…

Chapter 3: Elements and the Periodic Table

Unit 3 Lesson 1 The Atom Copyright © Houghton Mifflin Harcourt Publishing Company.

Atomic Theory. What is an Atom? An ATOM is the smallest part of an element that has all of the element’s properties. Atoms of different elements are different.

Atomic Model History.

Development of the Atomic Theory

1.3 Atomic Theory 1. John Dalton’s atomic theory - Matter is made up of small particles called atoms - Atoms cannot be created, destroyed or divided.

Introduction to Atoms Chapter 14 Section 1. History of Atom All atoms share the same basic structure All atoms share the same basic structure During past.

ATOMIC STRUCTURE REVIEW AND HISTORY OF THE ATOMIC MODEL Atomic Theory.

Warm Up: Density 9/10/14 1. Mass = 40g Volume = 20mL What is the Density? ___________ 2. Mass = 35g Density = 5 g /cm3 What is the Volume? 3. Density.

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

How did the atomic theory develop and change into the modern model of the atom?

Section 3 Modern Atomic Theory. Key Concepts What can happen to electrons when atoms gain or lose energy? What model do scientists use to describe how.

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.

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.

A Brief History of Atomic Theory This Section will focus on Scientists who have had an impact on the study of the atom.

Matter & The Atom. Matter The term matter describes all of the physical substances around us Matter is anything that has mass and takes up space The Universe.

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.

The Changing Model of the Atom

The Atomic Theory. Atom  The smallest particle into which an element can be divided and still be the same substance.  The smallest particle of an element.

Structure of an Atom Nucleus: Nucleus:Proton.

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

Introduction to the Atomic Theory. What is the Atomic Theory? – The Atomic theory is the study of the nature of atoms and how they combine to form all.

(8th) Chapter 4-1 Cornell Notes “Introduction to Atoms”

History of the Atom and Periodic Table.  Around 400 B. C., Democritus claimed all matter was made of tiny, indivisible particles called “atoms”.  Aristotle.

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 Models. INTRODUCTION Scientists have learned to use models to show things that are too big or too small to be shown easily.

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.

Democritus Occupation: Philosopher Dates of Discovery: 460 – 370 B.C. What was Discovered: That the world is made up of empty space and tiny particles.

Inside An Atom.

The evolution of the atom

You will have 3 minutes so work as fast as you can

Chapter 18: Properties of Atoms and the Periodic Table

Atoms: Development of the Atomic Theory

Atoms: Development of the Atomic Theory

Matter Unit Structure of an Atom.

SCH3U Unit 1: Matter, Chemical Trends and Chemical Bonding

Atom Model History - Democritus a fifth century B.C. Greek philosopher proposed that all matter was composed of indivisible particles called atoms (Greek.

The History of Atomic Theory

Chapter 4 Atoms.

SCH3U Unit 1: Matter, Chemical Trends and Chemical Bonding

Atoms: Development of the Atomic Theory

Atoms: Development of the Atomic Theory

Presentation transcript:

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 a particle called an Atom All atoms in a particular element, are identical in mass and no two elements have atoms of the same mass Daltons Model sometimes called the “Billiard Ball Model”

A British scientist J.J Thomson is credited with discovering a subatomic particle (a particle smaller than an atom) he named them Electrons He proposed the “raisin bun model”  Atom as a positively charged sphere, in which negatively charged electrons were embedded  The negative electrons balance the positive sphere, so the whole atom has no electrical charge

The Japanese physicist Hantaro Nagaoka refined the model of the atom to resemble a miniature solar system  At the center was a large positive charge  The negatively charged electrons orbited around this charge

British scientist Ernest Rutherford, suggested that atoms were mainly empty space through which the positive particles could pass, but at the core was a tiny positively charged center, he called the Nucleus. Calculated that the nucleus was about 1/ th the size of the atom

BOHR’S MODEL Danish researcher Niels Bohr  suggested that electrons do not orbit randomly in an atom  Move in specific circular orbits, or electron shells  Believed that electrons jump between these shells by gaining or losing energy. Hydrogen Atom

James Chadwick (British physicist)  Discovered that nucleus contained positively charged particles called Protons (+)  Neutral particles called Neutrons  The Neutron and Photon contain most the mass of an atom

Today… Most people still use the Bohr model Todays quantum mechanics model of the atom describes electrons as existing in a charged cloud around the nucleus