5.1 Evolution of the Atomic Model Clash of the Titans

Slides:

Advertisements

Similar presentations

Chapter 4 Lecture Basic Chemistry Fourth Edition Chapter 4 Atoms and Elements 4.3 The Atom Learning Goal Describe the electrical charge and location in.

Advertisements

Democritus Dalton 3. JJ Thomson 4. Rutherford 5. Bohr 6. Chadwick

The Structure of the Atom

Chapter 4 Atomic Structure

ATOMIC STRUCTURE AND HISTORY

Atomic Theory “History of. . . ”.

Cook.  At the end of the 19 th Century, scientists began to probe the submicroscopic world of atoms  Development of atomic models John Dalton: Thought.

AIM: Models of the Atom DO NOW:

Chapter 3 Atoms and Atomic Structure Write the bullets that are in black font.

Early Theories & Subatomic Particles ( )

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.

Atomic Discovery Early Models of the Atom 400 B.C. – Democritus proposed the existence of fundamental particles of matter that were indivisible and indestructible.

History of Atomic Structure

Atomic Structure Timeline Read Around the Room. Democritus (400 B.C.) Proposed that matter was composed of tiny indivisible particles Not based on experimental.

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

Chemistry Sheds Light on Our Lives Unit 4 Atoms and Light

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.

Atomic Theory Chapter 3 Sections 1 &2 9/18/14.

The Development of the Atomic Theory

The Atom Chapter 11 Notes and Review By: Mr. Steffen.

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.

Chapter 4: Atomic Structure

Chapter 4: Atomic Structure

EARLY Atomic theories.

Discovery of the Atom. Democritus  Democritus was an ancient Greek who had a philosophical idea of an atom.  His approach was not based on the scientific.

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.

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.

Mullis1 Democritus ( B.C.) Democritus was one of a few Greek philosophers who believed that all matter in the world was made of of indivisible parts.

History of Atomic Theory

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

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.

History of Atom Flip Book

By: Caleb VanderWal. Began to look for a description of matter more 2400 thousand years ago. His Theory Matter could not be divided into smaller and smaller.

The Chemical Behavior of Atoms Day 1. Curriculum  Big Idea: Atomic theory is the foundation for the study of chemistry.  Concept: Energy is absorbed.

Ch. 4: Atomic Structure 4.1 Defining the Atom. History  Democritus named the most basic particle named the most basic particle atom- means “indivisible”

Chapter 4 Atomic Structure

Basics Of Chemistry 8 th Science Matter Defined ► Matter – anything that has volume or mass. ► Everything you see and don’t see.

The Development of the Atomic Theory. Dalton’s Atomic Theory founder of the atomic theory atoms in Greek means indivisible, indestructible 1.All matter.

Development of Atomic Theory Ancient Times | Dalton's Postulates | Thomson's Discovery of Electron Properties | Rutherford's Nuclear Atom | Bohr's Nuclear.

Atomic Structure Chapter 4. Dalton’s Atomic Theory 4.1 John Dalton – 18 th century All matter is composed of atoms All atoms of a given element are identical.

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.

1 Chapter 4 Atoms and Elements 4.3 The Atom Basic Chemistry Copyright © 2011 Pearson Education, Inc.

The History of Atoms Not the history of the atom itself, but the history of the idea of the atom.

Discussion: Three Atomic Models of the Atom. Some people believe that theories never change. That isn’t true. Theories change until we get it right. The.

The History of the Atom Democritus to Rutherford.

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

Chemistry Chapter 4 Notes #1 09/10/10. Democritus Matter is composed of empty space where atoms move Atoms are solid, homogenous, indivisible, and indestructible.

Chapter 4. Atom Smallest particle of an element that retains its chemical identity Atoms of the same element cannot be separated chemically because they.

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.

The Evolution of the Atomic Model Section 5.1. Atoms are too small to be seen:

+ 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.

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

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

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.

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.

Class Notes: Atomic Models. Democritus= 400 B.C. – said the world was made of two things: empty space and tiny particles called “atoms” --said atoms were.

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

Atomic Theorists The ‘Who’s Who’ of the atomic world.

5.1 Evolution of the Atomic Model

Aim: Models of the Atom.

SCH3U Unit 1: Matter, Chemical Trends and Chemical Bonding

UNDERSTANDING THE PROPERTIES OF ELEMENTS

SCH3U Unit 1: Matter, Chemical Trends and Chemical Bonding

Soon you will be a rocket scientist

Presentation transcript:

5.1 Evolution of the Atomic Model Clash of the Titans Homework: Page 186 # 1, 2, 5, 6, 8

Atomic Theory John Dalton’s atomic theory described elements in terms of atoms which he believed to be small, indivisible particles that make-up all matter. Atomic Theory He stated that all the atoms of the same element are identical in mass and size, but different elements are made up of different atoms.

Joseph John Thomson determined that atoms contain negatively charged particles, which are now called electrons. He developed a model of the atom that shows electrons inserted throughout a mass of positively charged material. Thomson model

Ernest Rutherford updated the model of the atom as mostly empty space, with a small, dense, positively charged nucleus at the centre. His continued work, as well as that of others, eventually led to the identification of the proton and neutron in the nucleus. Rutherford model Neils Bohr revised Rutherford’s model of the atom by stating that electrons are stable in specific energy levels around the nucleus. Bohr Model

1. What is an atom? What are the three subatomic particles of an atom? An atom is the smallest particle of an element that has the same properties of the element. Protons – positively charged found in the nucleus 1 amu (atomic mass unit) Neutron – neutral (no charge) Electron – negatively charged found in energy levels surrounding the nucleus 0 amu (atomic mass unit)

2. What is Dalton’s description of an atom? List Dalton’s Atomic theory. Elements are made of tiny particles called atoms. Atoms cannot be created nor destroyed All atoms of a given element are identical. The atoms of a given element are different from those of any other element. Atoms of one element can combine with atoms of other elements to form chemical compounds.

Thomson’s Discovery of electrons: 3. Thomson’s experimental evidence indicated that all atoms contain the same negatively charged particles. Describe Thomson’s experimental evidence. When a ray was emitted from the negatively charged cathode it travelled to the positively charged anode. Thomson discovered that the same kind of negative ray was always emitted for all elements. These particles are now called electrons and are found in all atoms.

4. What is the difference between Thomson’s model of the atom and Dalton’s model of the atom? Dalton stated that different elements are composed of different atoms and that atoms cannot be divided into smaller particles. Thomson built on Dalton’s model by stating that the atom is a lump of positively charged materials with negative electrons inserted throughout.

5. Rutherford's experiment video

6. What are alpha particles 6. What are alpha particles? What is the source of these alpha particles? Alpha particles are positively charged particles The source is a very small amount of radioactive element called radium.

7. Describe Marie Curie’s contribution to science. Marie Curie was a polish born physicist who received two Nobel Prizes (one for physics and one for chemistry) She discovered and isolated the radioactive element radium.

8. What is the result of Rutherford’s gold foil experiment? Some of the particles were repelled backward instead of passing through the foil. Since the alpha particles are positively charged, Rutherford proposed that all the positively charged materials in an atom formed a small dense centre and that the electrons would have to be separated from it. He named this centre the nucleus

9. What did Bohr discover about the movement of electrons? Bohr proposed that electrons could only move within fixed regions (energy levels), rather than being able to move anywhere around the nucleus.

10. How can an electron move from one energy level to a higher energy level? For an electron to move from one energy level to a higher one, it must absorb a specific amount of energy (quantum).

11. Describe the nucleus of an atom. What is it made of? The nucleus is composed of two types of particles: the positively charged proton and a neutral neutron.

12. Draw the four models of an atom using diagrams. John Dalton Joseph John Thomson

12. Draw the four models of an atom using diagrams. Ernest Rutherford Niels Bohr