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.

Slides:

Advertisements

Similar presentations

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

Advertisements

4-1: Introduction to Atoms

Atomic Theory “History of. . . ”.

Atoms: Development of the Atomic Theory

A Brief History of Atomic Theory

Development of the Atomic Theory

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

Atoms: Development of the Atomic Theory

HISTORY OF THE ATOMIC MODEL ATOMIC THEORY

The History of Atomic Theory

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

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

A Pictorial History of Atomic Theory

Atoms: Development of the Atomic Theory

Atomic Theory Road Trip through Atomic Theory (Yes! You should take notes on this.)

The Atomic Model Chem 9.

Atom Models From Democritus to Bohr’s.

Structure of the Atom - Models Chapter 19 Section 1 – Part 2 Pages

The Atomic Theory. The Atom Protons and Neutrons.

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

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.

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 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.

Atomic Structure and Modelling. General Structure central nucleus containing protons and neutrons, tightly packed central nucleus containing protons and.

Development of Atomic Theory In 440 BC, Democritus, a Greek Philosopher theorized that if you cut an object in half, then cut that one in half, you would.

Development of the Atomic Theory

8 TH Grade Development of Atomic Theory. 1. Democritus (430 BC) proposes the idea that matter is formed of small pieces that could not be cut into smaller.

Investigating Atoms and Atomic Theory Describe the particle theory of matter. Describe the particle theory of matter. Use the Bohr model to differentiate.

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

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

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.

STRUCTURE OF AN ATOM.

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

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.

History of Atomic Theory

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

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.

Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

History of the Atomic Model How the model of the atom has changed or evolved over time.

Investigating Atoms and Atomic Theory Students should be able to: – Describe the particle theory of matter. PS.2a – Use the Bohr model to differentiate.

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

The Atom What defines the property of a substance.

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

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

The Story of... The Atomic Theory! The characters may change, but their ideas connect.

The History of Atomic Theory. Democritus B.C. Believed the universe was made of empty space and tiny bits of stuff called atoms that couldn’t.

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

ATOMIC THEORY CHAPTER 11.1 IN HOLT TEXTBOOK BCE Ancient Greek Philosopher Matter divided into a smaller and smaller piece the uncuttable piece.

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.

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.

The Development of Atomic Theory Chapter 4.1 Notes.

The Atomic Theory – p Democritus  Democritus, 440 B.C.  Thought matter was made of tiny particles  Believed these particles could not be cut.

Scientists and Their Contribution to the Model of an Atom

Atoms: Development of the Atomic Theory

Bell Ringer We mentioned the Periodic Table of __________ yesterday.

Atoms: Development of the Atomic Theory

Chapter 11 Section 1 Development of the Atomic Theory

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

Atoms: Development of the Atomic Theory

Introduction to Atoms Chapter 11.

The Atomic Structure of Atoms

Unit 2: History of the Atom

The Atomic Structure of Atoms

A Brief History of Atomic Theory

Atoms: Development of the Atomic Theory

Presentation transcript:

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 end up with a piece that cannot be divided He called the smallest piece and “atom” from the Greek word “atomos” meaning “indivisible”

1807: John Dalton British chemist First modern scientist to propose the existence of atoms Described it as an invisible, indestructible, solid sphere

1898: Sir J.J. Thomson British physicist Proposed “plum-pudding” model An atom is a solid mass of positively charged material with negative charges (electrons) scattered throughout Credited with discovering the electron

1911: Ernest Rutherford British physicist Proved that atoms are mostly empty space Discovered the proton Discovered the nucleus, which contains positively charged particles (protons) First to propose electrons circle nucleus

1913: Niels Bohr Danish scientist Proposed electrons move in different orbits, or energy levels

1932-Chadwick Model British Physicist Discovered the neutron. The existence of neutrons explained why atoms were heavier than the total mass of their protons and electrons.

Current Model Based on Bohr model Electrons orbit nucleus in random paths, or electron clouds Often called the “cloud” model “cloud” model

John Dalton’s Atomic Theory of Matter All elements are composed of atoms that cannot be divided. All atoms of the same element are exactly alike and have the same mass. Atoms of different elements are different and have different masses. An atom of one element cannot be changed into an atom of a different element. Atoms cannot be created or destroyed in any chemical change, only rearranged. Every compound is composed of atoms of different elements, in a specific ration.