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.

Slides:

Advertisements

Similar presentations

Development of the Atomic Theory

Advertisements

The Development of Atomic Theory

Development of the Atomic Theory

ATOMIC STRUCTURE AND HISTORY

 Identify who came up with the first theory of atoms?  Discuss what Dalton added to the atomic theory?  Explain how JJ Thomson discovered the electron?

History of Atomic Theory 1

HISTORY OF THE ATOMIC MODEL ATOMIC THEORY

Development of Atomic Theory Physical Science Chapter 4 - Section1.

The History of Atomic Theory

The History of Atomic Theory

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

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

Chapter 5: Atomic Theory Mr. Albaugh

The Atomic Model Chem 9.

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

The Atomic Theory. The Atom Protons and Neutrons.

History Behind the Atomic Theory

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

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.

Atomic Structure and History of the Atomic Theory

Using the Periodic Table

Section 1- Discovering the parts of the atom

Development of the Atomic Theory

For each scientist you need to know  Approximate date of discovery  Discovery  Experiment/Theory  Atomic Structure from their perspective FOCUS.

Atomos: Not to Be Cut or “indivisible” The History of Atomic Theory.

Development of the Atomic Theory READ pp

Development of the Atomic Theory What you should be able to do after studying this lesson/chapter: 1.Describe some of the experiments that led to the current.

Atomic Theory 15,000 kilotons.  Dismissed idea of the atom. Early Greeks Two schools of thought:  Matter is made of indestructible particles called.

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

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.

< BackNext >PreviewMain Section 1 Development of the Atomic Theory The Beginning of the Atomic Theory What Is an Element? Around 440 BCE, a Greek philosopher.

Atomic Model History.

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.

The Atomic Theory 1.Atomic Theory Matching 2.Atom Size 3.Democritus 4.Dalton – Ball Model 5.J.J. Thompson – Raisin Bun Model 6.Rutherford – Gold Foil Experiment.

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 (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.

Chapter 3 Atoms: The Building Blocks of Matter. Objectives: Students should be able to: Summarize the essential points of Dalton’s atomic theory. Describe.

Atomic Theory Chapter 11, Section 1. Ancient Greeks AristotleDemocritus (440 BC)  Break things apart forever and keep their identity  All things were.

4.1 The Development of the Atomic Theory

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

Introduction To Atoms Section 1: Development of The Atomic Theory.

400 B.C. Theorized that if you were to cut something in half, then cut it in half again and again… Eventually you would be left with something.

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 Theory Chapter 4 Section 1. Standards  Imbedded Inquiry  Recognize that science is a progressive endeavor that reevaluates and extends what is.

History of the Atomic Theory. Democritus  Greek Philosopher 400 B.C.  His theory: Matter could not be divided into smaller and smaller pieces forever,

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

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.

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

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.

The Development of Atomic Theory. Do Theories in Science Stay the Same? Ideas and theories in Science change as new information is gathered. Our theory.

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?

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

The Beginning of the Atomic Theory Democritus was a Greek philosopher who was among the first to suggest the existence of atoms. 460 BC – 370 BC.

The Development of Atomic Theory Part 1. Do Theories in Science Stay the Same? Ideas and theories in Science change as new information is gathered. (question.

The Development of Atomic Theory. Democritus was an ancient Greek philosopher who lived from B.C. What did Democritus conclude about cutting.

Atomic Theory and the Atom AC Physical Science Fall 2009.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 Development of the Atomic Theory The Beginning of the Atomic.

The Development of Atomic Theory. Do Theories in Science Stay the Same? Ideas and theories in Science change as new information is gathered. (question.

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.

Development of the Atomic Theory Chapter 4 - Section 1 p Vocabulary: 1.atom 2.Electron 3.nucleus 4.electron cloud.

S. Aldrich HISTORY OF THE ATOM 460 BCE Democritus develops the idea of atoms He believed that you could cut objects in half, over and over again,

The Development of Atomic Theory Chapter 4.1 Notes.

Opening Assignment 1. What does an atom look like?

Development of the Atomic Theory

Development of the Atomic Theory

Presentation transcript:

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 are elements. Elements can be chemically combined to form compounds. The atom was first seen in 1981 with the invention of the scanning tunneling microscope, but atomic theory (the ideas of the existence of atoms) has been around for over 2000 years!

Democritus (440 BC)-- Greek Philosopher Came up with the idea of the atom He thought that if you were to cut up a material you would eventually come to a piece that is "uncuttable". He named this particle atom, which comes from the Greek word atomos for "indivisible"

John Dalton ( late 1700s)-- English School teacher Developed the 3-part atomic theory based on his observations and published it in 1803 His theory states: 1)All substances are made of matter 2)Atoms of the same element are exactly alike*, atoms of different elements are different. 3)Atoms join with other atoms to make new substances--______________ The Dalton model of the atom

J.J. Thomson (1897)-- An atom has NO overall charge if it contains the same number of protons and electrons. His experiment used a Cathode Ray Tube to figure out what is inside the atom. discovered the electron which shows that the atom is, in fact, divisible. There are smaller particles within the atom itself.

tive What happened when the magnets were brought close to the tube? What does that suggest about the particles that make up the ray? In his model, the atom is a blob of positively charged material with negatively charged bits of electrons embedded in it.

Thomson's model Thomson called this the "plum-pudding model". The bits of plum represents the negative corpuscles (electrons). This is like chocolate chip ice cream

Ernest Rutherford ( )-- The Gold foil experiment Discovers that the atom is mostly empty space with a small dense and positively charged center called the nucleus. It is many times smaller than the diameter of the atom. In this model, the electrons move randomly around the nucleus

He discovers particles larger than electrons. He discovered the nucleus by shooting alpha particles at a piece of gold foil. + + An alpha Particle Alpha particles are emitted during radioactive decay, along with gamma rays. Rutherford used them as postitively charged bullets to fire at the gold foil.

In Rutherford's experiment, he used the positively charge alpha particles and observed: 1. most of the particles passed straight through the foil 2. some particles were slightly deflected 3. a few particles bounce back.

Rutherford proposes that atoms have a densely packed, positively-charged center which is surrounded by the negatively charged electrons. safe=active

·How can we use indirect evidence to figure how something is constructed or works without directly seeing it? ·How did scientists build our understanding of atoms? ·What is plum-pudding atomic model and what evidence was used to refute it? ·What is the Rutherford atomic model and what evidence is there to support it?

Niels Bohr (1913)-- suggested that electrons travel around the nucleus in definite paths.

Neutron Proton Electron Atoms Hydrogen +

Neutron Proton Electron Atoms Helium +

+ Neutron Proton Electron Atoms Carbon

Neutron Proton Electron Atoms Oxygen +

Eat your skittles, but do not leave a mess.

The Electron Cloud Model Our modern model of the atom suggests that there are clouds of electrons surrounding the nucleus and that the exact location of the electron cannot be predicted. Compare:

The Electron Cloud Model