Development of Atomic Models In 1897, J.J. Thompson discovered that matter, and thus atoms contain negatively charged particles which he called electrons.

Slides:

Advertisements

Similar presentations

We provide 3 slides, not for students, to separate the activities. 1. Rolling for Rutherford Classroom PPT.

Advertisements

Note Guide 1-1 Science and Studying Atoms What is science?What is science --Science begins as curiosity and tries to end with discovery. -- system of knowledge.

DO NOW How do you know what wind is? Objective: Describe ancient Greek models of matter and explain how Thomson and Rutherford used data from experiments.

Anything in black letters = write it in your notes (‘knowts’)

Science 9 : Models of the Atom

THE ATOM! ERNEST RUTHERFORD BY Saxon de Araujo. Assignment 4 Ernest Rutherford Ernest Rutherford conducted a famous experiment called the gold foil experiment.

The Gold Foil and the Nucleus

ERNEST RUTHERFORD & THE GOLD FOIL EXPERIMENT By Jake Easton & James Lampmann.

Nuclear Reactions Rutherford’s Alpha Scattering Experiment.

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

Anything in black letters = write it in your notes (‘knowts’)

Chapter Sections: 10.1, 10.5, 10.6, 4.3, 4.5 and a little extra History and Models of the Atom Click on me:

NOTES – Introduction to Atomic Theory ( )

Particles, Nuclei, and Isotopes

Introduction to Atoms Chapter 11 Material on Midterm.

Matter Unit Learning Goal #2: Summarize the major experimental evidence that led to the development of various models, both historic and current.

RUTHERFORD SCATTERING Edan Bainglass Jose Chavez Kennedy Izuagbe.

Unit 1 – Atomic Structure Bravo – 15,000 kilotons.

Atomic Theory. The Atom Recall the atom is the smallest particle making up an element.

How long have people been interested in understanding matter and its structure? Thousands of years Hundreds of years A few years Never.

The Structure of the Atom 3.2. Experiments  Atom – the smallest part of an element that retains the chemical properties of that element.  Subatomic.

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.

Ernest Rutherford Student of J.J. Thomson (1894) Early studies based on radioactivity Discovered that some materials emit radiation  Alpha particle: Eventually.

The Development of Modern Atomic Theory

26/11/2015 The Scattering experiment L/O :- To know the structure of an atom and to understand Rutherford and Marsden’s scattering experiment.

Atomic Models Lesson 2 Rutherford’s Model. Gold Foil Experiment Rutherford was attempting to lend support to Thomson’s atomic model by sending a beam.

Rutherford and Bohr Rutherford – Structure of the Atom

Drill – 10/12 Who was your scientist from last class? Was his model of the atom what we accept today? Was it completely wrong?

 In 1909, an undergraduate, Ernest Marsden, was being trained by Dr. Hans Geiger. To quote Rutherford (in a lecture he gave much later):

By: Brian Kober, Albert Lyou, and Charlie Romero.

Dalton’s Atom Note: Atomic Weights are Incorrect.

Ernest Rutherford By Mania Sehgal, Catherine Cincotta, Alec Tripodi.

Models of Atomic Structure. Dalton’s Small Dense Sphere.

Catalyst IN YOUR JOURNAL! 1. What are the two subatomic particles found in the nucleus? 2. What is the charge of a proton? An electron? 3. How do you.

Ernst Rutherford: Gold Foil Experiment=Discovery of the nucleus (+) It was quite the most incredible event that has ever happened to me in my life. It.

Atomic Structure.

Atomic Numbers. Henry Moseley ( ) “Moseley, as it were, called the roll of the elements, so that for the first time we could say definitely.

Ernest Rutherford (Nelson, New Zealand).

Atomic Theory The Bohr-Rutherford Model of the Atom.

BELLRINGER 10/2/14 What are the three particles that make up the atom?

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”

Unit 1 – Atomic Structure Bravo – 15,000 kilotons.

Atomic Theory  Atoms were thought to be the smallest particles of matter (Democritus)  Every type of matter was made of a different atom  This idea.

John Dalton’s Atomic Theory  Elements composed of small particles called “atoms”  All atoms of a given element are the same, but different from other.

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

A Summary of Sections: 4.1: Early Ideas About Matter 4.2: Defining The Atom.

History of the Atom By: Caitlyn Surdel. Ernest Rutherford.

How Rutherford Discovered the Nucleus: One of science’s greatest experiments!

You need to know: The structure of an atom The charge of a nucleus The structure of an alpha particle + + 

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.

Rutherford Scattering Experiment

ATOMS & RADIOACTIVITY ATOMS & RADIOACTIVITY THE ATOM THE ATOM.

By the end of this presentation, you should be able to: demonstrate a qualitative understanding of the  - particle scattering experiment and the evidence.

The Answer. Atomic Structure Chemistry Fall 2012.

Section 4.2 Defining the atom. The Atom What we know now: Definition: Atoms are the smallest particle of an element that retains the properties of that.

1 General Arrangement of the Subatomic Particles.

Atomic Structure Scale of the Universe.

The Roach in the Pudding

Lesson 2 Rutherford’s Model

Atomic and Nuclear Physics

Ch. 4: Introduction to Atoms

Contributions to the development of Models of the Atom

Timeline Use your textbook and any other resources available to research the contributions and approximate dates of the following scientists/ models: Democritus.

Modern Physics The Atom.

Rutherford’s Model Ernest Rutherford

Rutherford’s Model Ernest Rutherford

The discovery of the nucleus

Atomic Structure and Periodicity

Atomic Nuclear 1. Of or relating to an atom or atoms.

Mitchell Spencer Stephanie <3

Presentation transcript:

Development of Atomic Models In 1897, J.J. Thompson discovered that matter, and thus atoms contain negatively charged particles which he called electrons. Since most objects are neutral, he deduced that there must be a mass of positive charge surrounded by negatively charged electrons. The following diagram represents the accepted model of the atom that was present from 1897 until

In 1911 a New Zealand scientist by the name of Ernest Rutherford, working with graduate student assistants were about to collect data that would modify J.J. Thompson’s model of the atom. Rutherford had earlier discovered fairly large radioactive particles that had a positive charge, which were named alpha (  ) particles. education.jlab.org

Rutherford and his team shot these particles at a very thin piece of gold foil (approximately 250 atoms thick). On the other side of the gold foil was a zinc sulfide screen which glowed when hit by alpha particles. Model of Rutherford’s Apparatus A. Based on Thompson’s Model of the atom, make a hypothesis to what Rutherford and his team would have predicted would happen when the foil was hit with positively charged alpha particles. (put this in your notebook)

Click on the following link to observe an animation of Rutherford’s Experiment. OR 3.htm

deflected angle  degrees number scattered , , , , , Number of Alpha Particles Number of Alpha Particles Number of Alpha Particles Shot at Gold Foil Went Through Gold Foil Ricocheted to Source 264, , Alpha Particle Data From Rutherford’s Experiment B. Observe the following data carefully along with the animation on the previous slide. What are 3 ways that the model of the structure of the atom could be changed from Thompson’s model. Explain why you made these conclusions. Write these in your notebook.

Rutherford was quoted about his discovery by saying about the results of the gold foil experiment: “It was quite the most incredible event that ever happened to me in my life. It was as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you!” C. Based on your observations of his data, explain what Rutherford’s Quote means. Place this in your notebook. For further reading about how the electron was discovered, click here.