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Atomic Theory Time line

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Ozioma Chigbu

on 1 October 2015

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Transcript of Atomic Theory Time line

Atomic Theory Time line
BY: Ozioma Chigbu
7th period
Democritus
Democritus was a Greek philosopher and the first to acknowledge the existence of the atom
Democritus also stated that the atoms were indivisible
Democritus is nick named the father of the atom
Democritus named the atom atomos
400 B.C
Isaac Newton
1704
Issac Newton was a physicist and mathematician
Issac Newton is widely known for his laws of motion and gravity
Although Newton studied gases he theorized that microscopic pieces of matter swam through the air
John Dalton
1799
Dalton created the first atomic model
Dalton's model is known as the billiard ball model because it resemble a small billiard ball
Dalton's model had no internal structure
Like Democritus Dalton's model stated the atom was indivisible
HIs model also stated atom were indestructible and that each atom possessed a specific mass, size , and chemical behavior depending on that atoms element
Dmitri Mendeleev
1869
Dmitri created the first periodic table
He arranged elements into 7 different groups based on the similarities between them
He created the periodic law which states that elements are " periodic functions of their atomic number"
Michael Faraday
British physicist Michael Faraday theorized that atoms had an electrical component
In an experiment Michael placed a compound in water and placed 2 electrodes in the water he found the elements in the compound each separately clinged to each electrode
Faraday concluded that electrical forces were responsible for the joining of atoms in a compound
James Maxwell
1869
1873
James Maxwell is Scottish mathematician and physicist
Maxwell is credited with discovering the electromagnetic field
Through an experiment on the velocity of light and his own equation known as Maxwell equation he discovered the possibility of an electromagnetic wave in light
William Crookes
1879
William Crookes was a british chemist and physicist who isolated the element thallium
while examining sulfuric acid on a spectroscopic level he discovers a green substance left behind- thallium
William also discovered repulsion of radiation when he discovered the thallium was heavier when cold than wheni t was hot
Eugen Goldstein
1886
Eugene is a Poland born physicist credited with discovering anode rays and the possible existence of a proton
in an experiment with canal rays and cathode rays gold stein put both rays in a cathode tube and noticed the canal rays traveled in the opposite direction beamed through along the cathode rays
he theorized this happened because the rays carried different rays
George Stoney
1894
George Stoney is physicist commonly known for is studies on the spectrum of light
through the electrolysis of water and the kinetic theory of gases theorized what he called the atom of electricity
Stoney did not discover the electron he just proposed it existed but never found solid proof the electron
Wilhelm Rontgen
Wilhelm was a german physicist who discovered x-rays
fascinated by cathode rays rontgen beamed the rays through barium plantinocyanide Wilhem then notice images could create image on photographic plates
x-rays have 2,640 electron volts
1895
J.J Thomson
1897
English Physicist J.J Thomson theorized the atom was not indivisible and believed there were particles within the atom. With Cathode Rays he believed they were beams of particles smaller than the atom but this was not supported by his experiment
His theory was somewhat correct in the fact that the rays were material constituents of atoms- the electron
J.J also created the plum pudding model which was widely accepted because of easy analogy to plum pudding
The plum pudding model stated that the positive and negative charged particles (proton and neutron) were pieces lodged in jelly substance that fliled the atom
Ernest Rutherford
American physicist Ernest Rutherford and his students conducted the goldfoil experiment which taught the atom did indeed have empty space and positive charged particle the proton
In the experiment an a particle
beam was shot through gold foil where flashes of light appeared on the screen behind the foil
Rutherford also created a model where he stated the nucleus of the atom was a positive charge,the mass of the atom was its nucleus,the atom had a dense center,and the electron flew around the atom
1898
Marie Curie
1898
Marie Curie is credited with isolating polonium and radium also separating radium from radioactive substances
Curie has contributed to atomic theory by dispelling the theory that the ability to radiate was determined on an atom's arrangement of molecules. Instead it linked to the nucleus of the atom its self
Frederick Soddy
1900
Physicist Frederick Soddy was to the first to acknowledge the term isotope which is the term for elements with different forms (different number of neutrons)
While working with Rutherford he discovered isotopes when working with radiative decays
Max Planck
1900
Max Planck is a physicist who created the quantun theory that explains the natural behaviors of matter and energy on their atomic and subatomic levels.
before the quantum theory light was though to have moved on a never ending electromagnetic wave
Philipp Lennard
1903
1903 Philipp Lennard conducted the aluminum foil experiment where shot a beam of electron through aluminum foil and it passed through
his experiment further proved Rutherford theory of an atom having empty space
In Lennard's atomic model the proton and electron were bundled together in what he called dynamids in the nucleus of the atom
Hantaro Nagaoka
1903
Of all the atomatic models created Nagaoka comes the closest to the one we have accepted today
Nagaoka's model included the explanation of light when heated to high temperatures , different atomic masses ,the electrons were able to form ions ,and the atom had empty space
Nagaoka's model model was also called the planetary model because of the ring around the nucleus
Richard Abegg
1904
Richard Abegg contributed atomic theory through his own on rule which is known today as Abegg's rule.
In Abegg's rule he discovered and stated that elements are able to combine molecular based upon their valence, stable elements had full electron shells ,and his rule also explained the attraction of atom based on their opposite charges
Albert Einstein
1905
Albert Einstein is the first person to prove the existence of atoms with a microscope
Einstein also discovered that we thought was chaotic movement of water molecules for a few seconds the molecules could actually all move in the same direction
Robert Millikan
1909
With the use of Robert's experiment called the oil drip experiment Robert was able to measure the electric charge of an electron
the oil drop experiment was also used to find the mass of an electron

Rutherford
1911
Rutherford creator of the gold foil experiment also discovered the Nucleus of the atom was positive
Rutherford also found the nucleus to be extremely dense and small but he ASSUMED the electron were on the outside of the nucleus
H.G.J Moseley
1914
Henry Moseley found that the x-ray length of an atom has a relationship with it atomic number
Before Moseley's discovery the elements on the periodic table were organized by their atomic number but hey are now organized by mass
Henry also Found you could determine whether an atom was positive or negative using X-ray tubes
Niels Bohr
1922
Niels Bohr was one of Rutherford's students decided to improve rutherfords model
Bohr created his model in which the atom had different shell with different energy levels in which the electrons were located .the shells were referred to as electron clouds
unfortunately the model only worked perfectly for the element hydrogen
James Heisenberg
1927
James used equations from the frequency of spectral lines to describe atoms
Heisenberg created the principle of indeterminacy that stated that the exact location ,momentum, and velocity of an atom or sub atomic paricles can only be found within a certain limit
Erwin Schrodinger
1930
Erwin was a mathematician and Physicist
with his mathematical skills he was able to create a formula to find the relative location of an electron and as a physicist he created the Quantum Mechanical Model
The Quantum Mechanical Model which is built of quantum theory states that you can not find the position of an electron an its momentum at same time.
The model uses electron clouds that are in constant orbital the nucleus and the whole model itself is based on probability where as the bohr model is based on math
James Chadwick
1932
James Chadwick discovered the Neutron when he bombarded beryllium with radiation an the neutron was released
Lisa Meitner
1938
Lisa Meitner discovered fission when she and her lab partner Otto Hahn bombarded uranium with neurons and isotope 135 of uranium began to emit energy
Enrico Fermi
1942
Enrico Fermi was the creator of the first atomic reactor which was used in the creation of the atomic bomb
Fermi was also able to release the energy from the nucleus of an atom in controlled reaction

Giordano Bruno
1600
Giordano didnt contribute much
he believed God was Omnipresent and since atoms were everywhere he believed God was present in every atom
this was frowned upon in the catholic church and led to his execution
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