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Atomic Theory Prezi Project

Tyler Giles and Glenroy Barrett

Tyler Giles

on 5 December 2012

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Transcript of Atomic Theory Prezi Project

Democritus (460 - 370 BC) J.J. Thomson (1856 - 1940) Niels Bohr (1885 - 1962) Stated that every form of matter was also made up of small individual particles
Dalton used Democritus' theory of matter, and borrowed the names "atomos" and "atoms" to label the particles
Dalton stated in his book, that atoms of different elements could be universally distinguished based on their varying atomic weights
Dalton's theory also explained the composition of compounds, explaining that the tiny particles (atoms) in a compound were compound atoms John Dalton (1766 - 1844 All matter is composed of atoms
Chemical reactions occur when atoms are rearranged
Atoms cannot be made or destroyed
Compounds are formed from atoms of the element
All atoms of the same element are identical
Different elements have different types of atoms Dalton's Atomic Theory Ernest Rutherford (1871 - 1937) Developed the periodic classification of the elements
Founder of periodic law Dmitri Mendeleev (1834 - 1907) Rutherford Model Quantum Mechanical Model Henry Moseley (1887-1915) By Tyler Giles & Glenroy Barrett Atomic Theory Project One of the two original founders of the Atomic Theory
In his theory he suggested the world was made up of empty space and tiny particles called "atoms"
Believed atoms were the smallest possible particles of matter
He thought there were different ypes of atoms for each material in the world
He had no laboratory or any experimental equipment at his disposal to support his theory
Future Atomic Theories are based off of Democritus' theory He discovered electrons and isotopes and invented the mass spectrometer
He originally called electrons "corpuscles"
Determined that all matter is composed of tiny particles that are much smaller than atoms
Conducted the "Cathode Ray experiment", which helped with the discovery of electrons Put together the atoms for Peace Conference of 1995
Continued call for peaceful applications of atomic energy
"Open Letter to the United Nations" dated June 9, 1950
1954 helped to establish CERN Europe-based particle physics research facility His atomic theory described the atom as having a central positive nucleus surrounded by negative orbiting electrons
Conducted the "Gold Foil Experiment" Model suggested that most of the mass of the atom was contained in the small nucleus and that the rest of the atom was mostly empty space
atom having a central positive nucleus surrounded by negative orbiting elections Plum Pudding Model Antoine Lavoisier (1743 - 1794) Robert Millikan (1868-1953) Bohr Planetary Model A model of atomic structure that is based n mathematics and can be used to explain observations made on complex atoms
Although it's more difficult to understand than the Bohr model, it can be used to explain observations made on complex atoms
(of the atom) uses complex shapes of orbitals (sometimes called electron clouds) volumes of space which there is likely to be an electron Cathode Ray Tube Gold Foil Experiment This experiment was conducted by Ernest Rutherford
This experiment lead to the discovery that most of tan atom's mass is located in a dense region now called the "nucleus"
The data collected from the "gold foil experiment" show that he "plum pudding model of the atom was incorrect Physicists in the 19th century found out if they constructed a glass tube with wires inserted in both ends, and pumped out as much air as they could, an electric charge passed across the tube from the wires would create a fluorescent glow
The cathode ray became known as the "electron gun" Known as the "Father of Modern Chemistry"
Discovered that water was made up of hydrogen and oxygen
Showed that chemical elements were neither created nor destroyed, just combined into different compounds in chemical reactions
John Dalton based his modern atomic theory in 1803 on Lavoisier's work An atom model Proposed by J.J. Thompson
It is also known as the chocolate chip or blueberry muffin model
The plums clotting the dough are the negatively charged electrons
The Plum Pudding representation only strive to explain why most atoms were neutral
The model was invalidated 5 years after what is now known as the "Gold Foil Experiment" An atom consisting of a small, positively-charged nucleus orbited by negatively charged electrons
This model was proposed in 1915
This model was a modification of the Rutherford model
The energy of the orbit is related to its size, the lowest energy is formed in the smallest orbit Determine the charge of an electron
Measure the charge of an electron
Use the "Oil drop experiment" to measure the charge of an electron Law of Conservation of Mass Erwin Schrodinger (1887-1961) James Chadwick (1891 - 1974) Discovered the neutron
Bombed berylluim to produce radial and using the produced radial to bomb hydrogen and nitrogen, he produced hydrogen nucleur nitrogen
He received the Noble Peace Prize Made a powerful model of the atom
Combined the equations for the behavior of waves with the Broglie equation to generate a mathematical model for the distribution of electrons in an atom
His model assumes that the electron is a wave and tries to describe the regions in space or orbitals, where electrons are most likely to be found
His model describes the probability that an electron can be found in a given region of space at a given time Is a relation stated that in a chemical reaction, the mass of the products equals the mass of the reactants
Principle is equivalent to the conservation of energy Applied the X-Ray spectra to sort the chemical elements of the periodic table
Sorted chemical elements in the order in their atomic number
Many scientists believed Moseley lived a bit longer, he would have contributed much more to the scientific world Electron Cloud Model It is a model that maps the possible locations of electrons in an atom
The model is used to describe the locations of electrons around the atomic nucleus
Scientists like Ernest Rutherford, Niels Bohr, Werner Heisenberg and others led to the formation of an electron cloud model that came to be used to find the positions of electrons in an atom. J.J. The Questions & Answers What is an electron?
A subatomic particle with a negative charge
What did the Rutherford Model Prove?
It proves that most that most of the mass of the atom is contained in the nucleus and the rest is empty space
What charge does a proton have?
A proton has a positive charge
Who made the Plum Pudding Model?
J.J. Thomson made the Plum Pudding Model
What is stated in Dalton's Atomic Theory?
All matter is composed of atoms Bibliography http://www.biography.com/people/john-dalton-9265201?page=2#atomic-theory
Merrill Chemistry Textbook

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