Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Atomic Theory Timeline

No description
by

Mary Leisy

on 30 September 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Atomic Theory Timeline

An atomizer (from a perfume bottle) sprayed water or oil into the ''sample chamber''.
the drops went through a hole into a chamber (on the top was a positive plate and on the bottom was a negatively charged plate) where they were ionized (separated) by x-rays.
the particles that captured electrons fell slower or were suspended and the particles that did not capture electrons fell due to gravity.
Dalton's Atomic Theory
Elements are made of atoms
Atoms of the same element are the same in mass, size, and other properties
Atoms cannot be divided, created, or destroyed
Three types of atoms exist- compounds, molecules, and elements
In chemical reactions, atoms are combined, separated, or rearranged
When atoms of an element are combined, no more than two atoms can be joined
Atomic Theory Timeline
JJ Thomson
1876- 1918
Modern Atomic Theory



Atoms are the smallest unit of matter
Retain the properties of that substance

Hantaro Nagaoka
Ernest Marsden
Robert Millikan
Niels Bohr
Louis de Broglie
Dates of Influence
1924-1962
James Chadwick
Created By Cord Hesseltine
This is the Greek philosopher Democritus who began the search for a description of matter more than 2400 years ago. He asked: Could matter be divided into smaller and smaller pieces forever, or was there a limit to the number of times a piece of matter could be divided?

Sources
http://profmokeur.ca/chemistry/history_of_the_atom.htm
Didn’t believe the ancient Greek theory of atoms being of different sizes, regular geometric shapes and being in constant motion.
John Dalton
Aristotle
Henry Moseley
1913
Discovered that atoms contain a unique number of protons called the atomic number
1800-1844
Ernest Rutherford
Savannah Elliott
Democritus
His Theory
Matter can't be divided into smaller and smaller pieces forever, After a while the smallest peace would disappear. He named the smallest piece of matter “atomos,” which meant “not to be cut.”
Created by: Justin
Atomic Model
Created by: Justin

By Cord Hesseltine
Dalton's Atomic Model
Neutrons and electrons were unknown at the time
Atom had a fixed weight
Identified what element it was
Theory
Nagaoka said that a atom is a large sphere that is positively charged. He also said that the atom is circled by a bunch of negatively charged electrons.
Atomic Model
Development of Dalton's Model
Experimentation of gases
Certain gases could be combined in certain proportions
Erwin Schrodinger
1901-1925
Atomic model
Conclusion:
Elements combine in fixed ratios
460-370 BCE

His Method
To him atoms were small hard particles that were all made out of the same thing but had different shapes and sizes. They were infinite in numbers were always capable of moving or joining together.
1912-1915
1920-1923
1953
1923
1868
Experimentally verified Einstein's photoelectric equation
and made the first photoelectric determination
Worked on hot-spark spectroscopy
Nobel Prize for Physics
He died on the 19th of December in San Marino, California.
Birth
22nd of March, in Morrison Ill.
Falling drop experiment
In 1926, Erwin made a wave-equation that accurately gave the energy levels of atoms.
Other Discoveries
Color-blindness
Dalton's Law
pressure from gas
Theory of Electron Waves
Dates of Influence
Democritus began the search
for a description of matter
over 2400 years ago.
1908- Nobel Prize in Chemistry
Gold Foil Experiment- showed how there were particles that scattered off of the nucleus.
Atom
Orbital Theory
Splitting of the atom
First to cause a nuclear reaction
Elements
Can not be split
Can change their structure-heavy to light

de Broglies theory- the electron waves must be a whole wave length.

This means that there can't be any electrons in between the wave lengths.
Resources
http://everythingscience.co.za/grade-10/04-the-atom/04-the-atom-02.cnxmlplus
http://www.universetoday.com/38169/john-daltons-atomic-model/
http://humantouchofchemistry.com/john-dalton.htm
http://www.famousscientists.org/john-dalton/
http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/the-path-to-the-periodic-table/dalton.aspx
Sources
http://profmokeur.ca/chemistry/history_of_the_atom.htm
http://katringale.wikispaces.com/A3+Singer+Adrian+Democritus
http://timerime.com/en/event/155366/Democritus/
http://www-history.mcs.st-and.ac.uk/Biographies/Democritus.html
Nagoaka was the first person to defend a Saturnian atomic model that looked like Niels Bohr's atomic model. In his model the negative electrons circle around the nucleus like the rings of a planet which is positive.
Savannah Elliott
The "Raisin Bread" Model
Developed his own theory that said all matter consisted of four elements, four qualities, and two forces.
Schrodinger proved de Broglies theory was correct by using an equation that is now called
the Schrodinger equation. The problem with
the equation is that it would be hard to imagine
what it looks like.
Sources
http://www.japanese-greatest.com/technology/atomic-model.html
http://www.glogster.com/badhluuchia/hantaro-nagaoka/g-6l8m7aiu953bmhemm5o71a0
http://www.xtimeline.com/evt/view.aspx?id=962495
http://www.ask.com/question/nagaoka-atomic-theory
de Broglie only hypothesized this theory and Schrodinger later proved it was right
Negative charged particles called Corpuscles
Positively charged jelly substance

Method
He observed the light that was produced by the atoms to prove that the electrons were were he thought they were.
Instead of telling us where the electron is, the Schrodinger model tells us that an electron can be found in a given region of space at a given time.
Earth
Air
Water
Fire
The Bohr model was only one-dimensional, while Schrodinger's was three-dimensional.
Thomson's Theory
Schrodinger's probability model
Niel Bohr's theory on the atom
Dates of Influence
1913-1963
In 1909 Ernest Marsden under the direction of Ernest Rutherford and Hans Geiger, helped discover the internal structure of an atom by using the gold foil experiment.
Nucleus
Gold Foil Experiment
The nucleus is in the center of the model and is made up of a certain number of protons and neutrons. Each of the outer layers from the center can only hold a certain amount of electrons. This also determines the properties of an element.
The nucleus is in the middle of the atom and almost all of the positive charge is there.
Protons and neutrons are make up the nucleus.

Protons and Neutrons
Protons are particles that have a positive charge and is the opposite of an electron
Neutrons are different particles that have no charge
Electrons
Niels Bohr's other discoveries
Electrons, which are negatively charged, orbit around the nucleus.
Liquid Droplet Theory
Quantum Theory
Method to develop this new model
Gold Foil Experiment
Rutherford expected that when he shot a beam of particles through foil, that it would go strait through and bounce off the electrons from the plum pudding model.
When he did his experiment the beam bounced off at large angles.
He concluded that all the mass and positive charge of the atom was located in the middle.
Discoveries related to the atom
Splitting of the atom
Nuclear reaction
Kelsey :)
Dryness
Hotness
Coldness
Moistness
Conflict
Harmony
Methods used to develop this model
He formulated a method of calculating the different energy levels of the hydrogen atom.
Arranged elements in order of increasing atomic number, which resulted in a periodic pattern of properties.
Atoms
1943-1946
1957-1962
1974
1950+1951
1932
1891
Worked on the Manhattan Project
as head of British mission
United Kingdom Atomic Energy Authority
only as a part time member
He Received Medals
Copley medal (1950)
rewarded to people with outstanding achievements in science
Franklin Medal of the Franklin Institute in Philadelphia (1951)
for achievements in science
Death
July 24th
Birth
October 20th
Proved Neutrons Existence
Structure
Other discoveries related to atomic theory
Protons and Neutrons
Matter and wave–particle duality
Conjecture of an internal clock of the electron
Located in the nucleus
Protons are positively charged
Neutrons have no charge
Electrons
Negatively charged
Orbit the nucleus
Caden
He only lived to be 27 so he didn't have much of a chance to discover anything more.
TelRae
Classification
TelRae
The number of protons and neutrons in the nucleus
Protons- atomic number
Isotope- number of protons and neutrons are not the same
Mass number- the sum of the neutrons and atomic number
What does the oil drop apparatus do?
X Rays
1000 times smaller than the smallest atom
JJ Thompson
Caden
By: Caitlin
Kelsey :)
With his experiment
John Dalton's Theory
In chemical reactions atoms are combined, separated, or rearranged.
This is part of his theory that is true to the modern theory.
By: Caitlin
James Chadwick's Experiment
384 B.C.
Particles that passed through Beryllium
Uncharged
Slightly larger than protons
Named them Neutrons
Small, positively charged particles with negatively charged particles spaced throughout
Neutral
Divisible
Method Used
Cathode Ray Theory
flowed an electric current along a path
placed magnetic plates on each side, one positive and one negative
observed to see if the current bent towards one plate or the other

Other Discoveries
Isotope & Mass Spectrometry
Radioactivity of Potassium
Hydrogen had a single electron per atom

Sources
http://en.wikipedia.org/wiki/J._J._Thomson
http://www.tutorvista.com/science/jj-thomson-atomic-theory-0
https://sites.google.com/site/modernatomicehs/dalton-and-thomson-s-atomic-models-1
http://www.biography.com/people/jj-thomson-40039
http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx
1910
Full transcript