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100
Democritus
Democritus was born in 460 bc and studied philosophy, math, and geometry which he really loved. He came up with the atomic thesis in 465 bc and these are what they are:
1.All matter consists of invisible particles called atoms.
2. Atoms are indestructible.
3. Atoms are solid but invisible.
4. Atoms are homogenous.
5. Atoms differ in size, shape, mass, position, and arrangement.
https://the-history-of-the-atom.wikispaces.com/file/view/demo__atom_model.gif/183311563/demo__atom_mo -
200
Aristotle
Aristotle was born in 384 bc and studied a lot of philosophy, biology, physics, math, etc. He taught many people about science and math at a place called The Academy. Aristotle contribution to the atom was that he disagreed with Democritus' theory for atoms. He thought atoms were made up of water, air, fire, and earth. People thought that Aristotle was right so much that they over thought it for 2000 years. It was later incorrect however.
http://www.oocities.org/capecanaveral/7997/elements.gif -
Antoine Lavoisier
Antoine Lavoisier was born in France in 1743. His contribution of the atom was that he did an experiment that shows that matter can't be created or destroyed. Matter will always be matter. This is also known as the law of conservation. He helped us know what an atom actually is. It's a part of matter that cannot be destroyed or made in any possible way shape, or form
http://chemwiki.ucdavis.edu/@api/deki/files/8296/NUCLEAR_ATOM.jpg?size=bestfit&width=510&height=382&revision -
John Dalton
John was born in Cumberland, England to a Quaker family in 1766. He studied meteorology and was fascinated by science. John worked as a teacher and a lecturer. He contributed to the atom by making an atomic theory. It stated that the elements are made from atoms. It stated that an element is a pure substance that can't be broken down into simpler substances. In short everything is made of atoms.
https://the-history-of-the-atom.wikispaces.com/file/view/wefuklsnsgnjkbcashvknfljsdklfjk_h_!!!_CORN -
JJ Thompson
JJ was born in 1856 in Manchester, England. He went to Owens College in 1870 and then went to Trinity college six years later. Jj's contribution to the atom discovery was that he found out that atoms can be split and found that an atom has positive cores and negative cores inside of it. This helped people have a better view of how atoms are made up today.http://2011modelsb.wikispaces.com/file/view/Thomson_Plum_Pudding_Atomic_Model.jpg/254794720/440x413/Thomson_Plum_Pudding_Atomic_Model.jpg -
Max Planck
Max Planck was the first person to come up with quantum theory which other scientists who were using to find out about the atom did. It explains how energy react to Ina subatomic level. In 1900 Max show his theory to scientists in Germany explaining new terms like quanta meaning that each individual units had energy inside them. Later in 1927 Werner Heisenberg perfected the practice. -
Ernest Rutherford
Ernest was born in 1871 in Nelson, New Zealand. He had an early education when he was 16 making him able to go to Trinity College. His contribution to the discovery of the atom was that he discovered that atoms could be magnetic and found tons of currents in the frequency of atoms. This helped scientists have a better understanding of the atom and helped other scientists learn more about physics and chemistry
http://abyss.uoregon.edu/~js/images/rutherford_atom.gif -
Niels Bohr
Niels Bohr was born in 1885 in Copenhagen Denmark. He went to Copenhagen University to study physics in the year 1909 and got his degree. Bohr contributed to the discovery of the atom by making an atomic structure that shows Ernest's Rutherford's discovery of the atomic atom. It showed that the nucleus is in the center and then the first shell has 2 electrons, then 8 on the second, and then 18 electrons on the third.
http://images.tutorvista.com/cms/images/38/bohr-atom-model.JPG -
Erwin Schroedinger
Erwin Schroedinger helped out the discovery of the atom by using Niels Borhs drawing of the atom. he found out how to calculate the probability of knowing where an electron actually is. He used mathematical probability by showing how and where the electron is. He didn't however know how to find the exact location of the electron but found the odds of an electron. -
Henry Moseley
Henry Moseley helped out by writing the atomic numbers out on the periodic table. he contributed a lot during his time and over the course of his life, he made numerous contributions to science. This helps us now to distinguish where the elements come and how they are now arranged in different places and characteristics. -
James Chadwick
James was born in Cambridge,England and studied in physics at university of Liverpool and university of Manchester. His contribution to the atom was that he discovered what a neutron was. A neutron that has no positive electron. In a way it's neutral ti the atom .
http://4.bp.blogspot.com/_WI2zSLl2Z_4/TQdbE0K6rHI/AAAAAAAAABA/CAD5aDQAuhA/s1600/400px-ChadwicksModel.png -
Werner Heisenberg
Heisenberg was born In 1901 in Würzburg Germany. He went to University of Munich to learn more about physics. Werner made the first version of quantum physics called the matrix mechanics. Werner's contribution to the atom was that he discovered the behavior of electrons and how they moved. This now helps scientists compare now how many electrons and particles are in the atom now. In short Werner used quantum mechanics to help out for finding the atom.
https://the-history-of-the-atom.wikispaces -
Robert Millikan
Robert Millikan in 1908 found out how long each electron charges. he made up an experiment that showed how long electrons charge by using droplets to measure the time it would take to have a single particle charged. This now helps us how they charge and how they are used for in chemistry and we should all thank him for doing that.
http://ffden-2.phys.uaf.edu/212_fall2003.web.dir/Ryan_McAllister/apparatus.jpg
