Presentation is loading. Please wait.

Presentation is loading. Please wait.

What does an atom look like?

Published byMargery Dennis Modified over 6 years ago

Similar presentations

Presentation on theme: "What does an atom look like?"— Presentation transcript:

1 What does an atom look like?
How did scientists figure out what it looks like? Truemper 2016

2 Atomic Theory Truemper 2016

3 Democritus Smallest piece of all matter is not divisible
He named the smallest piece of matter “atomos,” meaning “not to be cut.” Truemper 2016

4 Truemper 2016

5 John Dalton 1760-1844 Father of Modern Atomic Theory
matter is made of atoms atoms in an element are identical different elements have different atoms atoms maintain their mass even in a chemical reaction Truemper 2016

6 J.J. Thomson 1897 Truemper 2016

7 When a magnet was placed near the beam of light, it separated into two parts
Truemper 2016

8 When a magnet was placed near the beam of light, it separated into two parts
Truemper 2016

9 Thomson Model Where did they come from? This surprised Thomson, because the atoms of the gas were uncharged. Where had the negative charges come from? Truemper 2016

10 Thomson Model Proposed a model of the atom that is sometimes called the “Plum Pudding” model. a sphere with negatively charged electrons scattered. Truemper 2016

11 J.J. Thomson 1897 Hear Thomson talk the Electron
discovered electrons (charged particles) Truemper 2016

12 Truemper 2016

13 Rutherford 1911 Using atoms to see what is inside of other atoms
Truemper 2016

14 Rutherford Truemper 2016

15 Rutherford Experiment Molecular Expressions
Truemper 2016

16 Rutherford’s experiment: Discovery of the Nucleus
Most of positively charged particles Rutherford shot at the gold foil passed right through without changing course at all. However, some did bounce away from the gold sheet as if they had hit something solid. He knew that positive charges repel positive charges. Rutherford found the Nucleus Truemper 2016

17 Rutherford’s model A nucleus in the center, with electrons moving around in the open space Truemper 2016

18 1) Most of the volume of the atom is ...
empty space Truemper 2016

19 2) Virtually all mass atom found in ...
... the nucleus Truemper 2016

20 3) Strong, positive charge in the center of atom
                               3) Strong, positive charge in the center of atom Truemper 2016

21 Relative Sizes in the Atom
Truemper 2016

22 Did you know ... If the atom were the size of a football stadium, the nucleus would be the size of a....   Truemper 2016

23   .... a marble!!!  Truemper 2016

24 Truemper 2016

25 Bohr Model Electrons move in definite orbits around the positive nucleus Like the planets orbiting the sun. These orbits, or energy levels, are located at certain distances from the nucleus. Truemper 2016

26 Truemper 2016

27 Chadwick discovers the nucleus has neutrons
Truemper 2016

28 Truemper 2016

29 Truemper 2016

30 Electron Cloud “Wave” Model
Modern View of the Atom Electron Cloud “Wave” Model Truemper 2016

31 Electron Cloud Model According to the theory of wave mechanics, electrons do not move about an atom in a definite path, like the planets around the sun. Truemper 2016

32 Schrodinger and the Electron Cloud:
Electrons whirl about the nucleus billions of times in one second Location of electrons depends upon how much energy the electron has. Truemper 2016

33 Electron Cloud: Depending on their energy they are locked into a certain area in the cloud. Electrons with the lowest energy are found in the energy level closest to the nucleus Electrons with the highest energy are found in the outermost energy levels, farther from the nucleus. Truemper 2016

34 NOVA scienceNOW Amazing Atoms PBS.mp4
Truemper 2016

35 Atomic Theory Song by Veritasium
Truemper 2016

36 Greek X Dalton Thomson Rutherford Bohr Wave Indivisible Electron
Nucleus Orbit Electron Cloud Greek X Dalton Thomson Rutherford Bohr Wave Truemper 2016

Download ppt "What does an atom look like?"

Similar presentations

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

Democritus Dalton 3. JJ Thomson 4. Rutherford 5. Bohr 6. Chadwick
The History of Atomic Theory

The History of Atomic Theory
AIM: Models of the Atom DO NOW:

AIM: Models of the Atom DO NOW:
The History of Atomic Theory

The History of Atomic Theory
The History of Atomic Theory

The History of Atomic Theory
The History of the Atom.

The History of the Atom.
The Development of the Atomic Theory. Investigating Atoms and Atomic Theory Students should be able to: Students should be able to: Describe the particle.

The Development of the Atomic Theory. Investigating Atoms and Atomic Theory Students should be able to: Students should be able to: Describe the particle.
Atomos The History of Atomic Theory. Atomic Models This is the Bohr model. In this model, the nucleus is orbited by electrons, which are in different.

Atomos The History of Atomic Theory. Atomic Models This is the Bohr model. In this model, the nucleus is orbited by electrons, which are in different.
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 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.
Investigating Atoms and Atomic Theory Atoms cannot be divided using chemicals. They do consist of parts, which include protons, neutrons, and electrons,

Investigating Atoms and Atomic Theory Atoms cannot be divided using chemicals. They do consist of parts, which include protons, neutrons, and electrons,
Investigating Atoms and Atomic Theory Students should be able to: Students should be able to: Describe the particle theory of matter. PS.2a Describe the.

Investigating Atoms and Atomic Theory Students should be able to: Students should be able to: Describe the particle theory of matter. PS.2a Describe the.
Atomos: Not to Be Cut or “indivisible” The History of Atomic Theory.

Atomos: Not to Be Cut or “indivisible” The History of Atomic Theory.
The History of Atomic Theory Ideas that explored how matter is made up of atoms…led to models of the atom.

The History of Atomic Theory Ideas that explored how matter is made up of atoms…led to models of the atom.
Investigating Atoms and Atomic Theory Describe the particle theory of matter. Describe the particle theory of matter. Use the Bohr model to differentiate.

Investigating Atoms and Atomic Theory Describe the particle theory of matter. Describe the particle theory of matter. Use the Bohr model to differentiate.
Atomos: Not to Be Cut The History of Atomic Theory Date Objective: Identify Scientists and their contributions to the Atomic Theory.

Atomos: Not to Be Cut The History of Atomic Theory Date Objective: Identify Scientists and their contributions to the Atomic Theory.
The History of Atomic Theory Lecture 1: Spring 2013.

The History of Atomic Theory Lecture 1: Spring 2013.
Atomos: Not to Be Cut The History of Atomic Theory.

Atomos: Not to Be Cut The History of Atomic Theory.
Democritus This is the Greek philosopher Democritus who began the search for a description of matter more than 2400 years ago. This is the Greek philosopher.

Democritus This is the Greek philosopher Democritus who began the search for a description of matter more than 2400 years ago. This is the Greek philosopher.
History of the Atomic Theory. Democritus  Greek Philosopher 400 B.C.  His theory: Matter could not be divided into smaller and smaller pieces forever,

History of the Atomic Theory. Democritus  Greek Philosopher 400 B.C.  His theory: Matter could not be divided into smaller and smaller pieces forever,
Investigating Atoms and Atomic Theory Students should be able to: – Describe the particle theory of matter. PS.2a – Use the Bohr model to differentiate.

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

Similar presentations

Ads by Google