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Antoine Lavoisier
Antoine Lavoisier had a big part in the law of conservation of mass and was the person who defined what an element was. He also found out water was made up of oxygen and hydrogen. Reference: http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/early-chemistry-and-gases/lavoisier.aspx -
Joseph Proust
Joseph Proust came up with the of definate proportions which was the law that the proportions of two given elements under any conditon will remain the same. Reference: http://www.vzhang.com/vzfiles/joseph_proust.htm -
John Dalton
John Dalton proposed is atom theory which says all of matter is composed of atoms, the atoms of an element each have there own unique characterisics, and there are three different types of atoms, simple, compound, and complex. Reference: http://scienceworld.wolfram.com/
biography/Dalton.html -
William Crookes
William Crookes found a new element called thallium. He did lots of work on it finding all the information he could on it. He also used a vaccum for some of the research. Reference: http://www.nndb.com/people/965/000100665/ -
JJ Thomson
JJ Thomson discovered the electron which he calculated to having a very small mass and found it to be much smaller than an atom. Soon after in 1904 he came up with his own idea on what the atom looked like using the plum pudding model. Reference: http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx -
Max Planck
Max Planck came up with the quantum theory which described that energy can be given off or absorbed in small units called quanta. This helped scientists learn more about the nature of light. Reference: http://dwb.unl.edu/Teacher/NSF/C04/C04Links/www.fwkc.com/encyclopedia/low/articles/q/q021000030f.html -
Marie Curie
Marie Curie worked with her husband Pierre on radioactivity. They both found two new radioactive elements called polonium and radium. Reference: http://nikkibeecalanas.blogspot.com
/2012/08/marie-curie-and-atomic-theory_17.html -
Albert Einstein
Albert Einstein came up with a mathmatical way to determine the size of an atom and molecule. He also published the theory of relativity. Reference: http://coraifeartaigh.files.wordpress.com
/2008/07/einsteinproof1.pdf -
Niels Bohr
Niels Bohr came up with the fact that electrons have a fixed orbit around the nucleus of an atom and he also came up with his own model of an atom using the new information he found. Reference: http://www.nndb.com/people/560/000024488/ -
Ernest Rutherford
Ernest Rutherford became the worlds first person to split an atom. He also came up with his own version of the atom by shooting tiny particals into a screen and watching which way they bounced. Reference: http://www.rutherford.org.nz/ -
Louis de Broglie
Louis de Borglie came up with the theory of partical-wave duality which made it simple to explain how atoms, molecules, and protons behave. Reference: http://www.nndb.com/people/313/000072097/ -
Friedrich Hund
Friedrich Hund came up with Hunds rules which states every electron orbital must be ocupied before another can be occupied twice and all elecrtons that are singlely occupied must have the same spin. Reference: http://chemwiki.ucdavis.edu/Inorganic_Chemistry/
Electronic_ Configurations/Hund's_Rules -
Werner Heiesenberg
Werner Heiesenbergs contributions to the atomic theory was that he founded the uncertainly principle which states that electrons do not move in a set path and he went further on to study the nature of how they did move. Reference: http://the-history-of-the-atom.wikispaces.com/Werner+Heisenberg -
Erwin Schroedinger
Erwin Schroedinger used mathmatical equations that helped describe the location and energy level of an electron he also helped with the quantum mechanics model and the wave theory of matter. Reference: http://en.wikipedia.org/wiki
/Erwin_Schr%C3%B6dinger -
James Chadwick
James Chadwick was the man who proved the existence of the nuetron which boosted the study of nuclear research. Reference: http://www.thocp.net/biographies/chadwick_james.htm
