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

Slides:

Advertisements

Similar presentations

Ch. 3.2 Atomic Structure On your bell work sheet, answer the following. When are zeros significant? When do you use the fewest number of Significant Figures?

Advertisements

Unit 3: Atomic Theory Section A.2 – A.3

5.3.1 The Nuclear Atom.

RUTHERFORD’S EXPERIMENT How he found out how atoms were put together.

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.

Radiation L.O: Describe an isotope understand properties of alpha, beta and gamma radiation Explain background radiation.

Radiation, nuclear fusion and nuclear fission

ERNEST RUTHERFORD AND THE ATOMIC MODEL

11 Atomic Theory. 2 A HISTORY OF THE STRUCTURE OF THE ATOM.

Chapter 4: Glow in the Dark

History of Atomic Structure

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.

The History of the Atomic Model In other words, the old guys who came up with the atom.

Happy Mole Day! Mole day is celebrated every October 23rd between 6:02 in the morning and 6:02 in the evening. Scientists celebrate mole day because the.

The Development of Atomic Theory. I. Early Models of Atomic Structure The work of Dalton, Thomson, and Rutherford…

RUTHERFORD SCATTERING Edan Bainglass Jose Chavez Kennedy Izuagbe.

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.

STANDARD A MOST OF THE SLIDES FROM THIS POWER POINT PRESENTATION COMES FROM HOLT CHEMISTRY. PLEASE DISREGARD THE CHAPTER NUMBERS. STANDARD A ASSESSEMENT.

Atomic Structure A level At The Sixth Form College Colchester.

Section 4.2 Defining the Atom.

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.

Hans Geiger Ernest Marsden. Hans Geiger Born in Germany on September 30 th 1882 Studied Physics in Munich before moving to Manchester Studied mathematical.

Rutherford’s alpha scattering experiment. source of alpha particles thin gold foil photographic film beam of  particles most pass straight through 1 in.

Rutherford’s experiment Day 2. Last time Discussion of early atomic model- the plum pudding model To refresh your memory: – Large slightly positive mass.

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

Rutherfords Gold Foil Experiment The History of Atomic Theory.

Molly Bullock Brad Roche Ivan Espino

The scattering experiment.  The scattering experiment.

Atomic Structure A level at The Sixth Form College Colchester Adapted from: An example of How Science Works: Development of the Model of Atomic Structure.

Edexcel A2 Physics Unit 4 : Chapter 3 : Particle Physics 3.1: Probing Matter Prepared By: Shakil Raiman.

23.1 Atomic structure The Rutherford scattering experiment  In 1911, Ernest Rutherford carried out the famous Rutherford scattering experiment to explore.

Physical Science Goal 5A Test Review Technique 1 Flash Cards.

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

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.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 2 The Structure of the Atom Objectives Summarize the observed.

+ Evidence For The Atomic Structure Noadswood Science, 2012.

DISCOVERY OF THE NUCLEUS: PROTONS AND NEUTRONS. ERNEST RUTHERFORD Determined the structure of the atom First to split the atom.

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

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

How small is an atom?  An Atom is the smallest particle into which an element can be divided and still be the same substance.  Atoms are made of three.

14.1 Structure of the Atom  In order to understand atoms, we need to understand the idea of electric charge.  We know of two different kinds of electric.

IP The atom and the discovery of the nucleus © Oxford University Press 2011 The atom and the discovery of the nucleus.

Atomic structure and radioactive decay

Atomic Structure Scale of the Universe.

The Roach in the Pudding

Atomic and Nuclear Physics

By the end of this presentation you should be able to……

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

Rutherford’s α scattering experiment

History of the Atomic Model 2.1

ATOMIC HISTORY & ISOTOPES

History of the Atomic Model 2.1

History of the Atomic Model 2.1

Atomic Structure and the Alpha Scattering Experiment

History of the Atomic Model 2.1

Rutherford’s Model Ernest Rutherford

Atoms and Isotopes 1.

THE ATOMIC MODEL Learning Challenges

Pioneers of Nuclear Research

Presentation transcript:

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

Lesson Outcomes What was the plum pudding model? GRADE C How was the plum pudding model disproved? GRADE B Describe Rutherford, Geiger and Marsden’s experiment. GRADE B Explain their findings. GRADE A

Rutherford’s Alpha Scattering Experiment The is one of the most important experiments in the history of science. Professor Rutherford wanted to see what happened to alpha particles when they collided with atoms. He asked two of his students (Hans Geiger and Ernest Marsden) to carry out the experiment.

Shield Source of alpha particles Very thin gold foil Vacuum (air pumped out) Moveable Microscope Zinc sulphide screen (glows when hit by alpha particles) Rutherford Experiment: the set up Geiger and Marsden counted the tiny green flashes in the microscope produced when alpha particles hit the screen. Both Geiger and Marsden described this as one of the most difficult and boring experiments they’d ever had to do.

Geiger and Marsden placed the microscope as shown. As expected, most of the alpha particles went straight through the foil. A few alpha particles were scattered by angles less than 90º, also as expected.

Why didn’t you put the microscope behind the gold foil? Rutherford Geiger Marsden There’s no point! There is absolutely nothing inside an atom that could reflect an alpha particle! It would be a complete and utter waste of time!

Under protest, Geiger and Marsden placed the microscope behind the gold leaf. Much to their surprise, a very small number of alpha particles (about 1 in 8000) bounced off the gold atoms! They handed the results to Professor Rutherford who now had to explain what was going on.

Up until Rutherford’s experiment, it was thought that atoms were like a ‘plum pudding’ – the electrons were negative “plums” embedded in a ball of positive pudding. But, this is what he found. What do you think he deduced about the structure of an atom from these results?

Rutherford’s Alpha Scattering

The top scientific honour in the world is the Nobel Prize. Ernest Rutherford was awarded the Nobel Prize in 1908 for discovering the atomic nucleus. (He deserved it – it was his calculations based on the data that measured the size of the nucleus. Geiger and Marsden were given full credit in the published scientific paper.) However, he was slightly disappointed because he was given the Nobel Prize for Chemistry instead of Physics Rutherford All science is either Physics or stamp collecting.

Rutherford’s Model (Nuclear Model) The electrons ‘live’ in specific energy levels. An electron will move up to a higher energy level if it is given energy. An electron will move down to a lower energy level if it loses energy.

Lesson Outcomes What was the plum pudding model? GRADE C How was the plum pudding model disproved? GRADE B Describe Rutherford, Geiger and Marsden’s experiment. GRADE B Explain their findings. GRADE A

The protons inside a nucleus repel each other because they each have a positive charge. It takes an incredibly strong force to hold the nucleus together. This incredibly strong force is called the strong nuclear force. Unlike the electromagnetic force, it has a very short range. How do the protons manage to stay in the nucleus?