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Period: to
History of Atomic Theory
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Erwin Schrodinger
Erwin Schrodinger's strengths leay in physics and maths. He did experimental work in colour and light. His interest in how an electron in an atom would move as a wave lead to The Schrodinger Equation. This equation was a great contribution to quantum mechanics. His theory stated that different energy states of an atom’s electrons could be described and even predicted via wave equations.
SOURCES:
http://www.biography.com/people/erwin-schr%C3%B6dinger-9475545#his-own-wave-equation-
http://www.fam -
Marie Curie
Marie Curie was know for her work on radio activity. She researched uriaum and discovered polonium and radium. She found that polonium was 300 times more radioactive that uranium and that radium was several million times more radioactive than uranium. Marie in researching radioactivity
was able to find that adioactivity was produced by radioactive elements such as uranium, thorium, polonium and radium.
SOURCES:
http://www.famousscientists.org/marie-curie/
http://www.biography.com/people/mar -
Ernest Rutherford
Ernest discovered a detector for electromagnetic waves. He was the first person to name radiation 'gamma' and to transform one element into another. He was the creator if the 'disintergration theory'. Ernest created the concept of the "nucleus", his greatest contribution to physics
SOURCES:
http://www.famousscientists.org/ http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1908/rutherford-bio.html -
Henry Mosely
Henry discovered a relationship between wavelengths and their atomic numbers, He predicted missing elements and their periodic numbers in the Periodic Table. He also developt x-ray equpitment which lead to the study of atomic stucture. This again helped him when establishing a scientific basis for the Periodic Table. Henry's work has allowed the modern day Periodic Table to
be based on the atomic number of elements.
SOURCES:
www.famousscientists.org
www.chemistry.co.nz/henry_moseley.htm -
Niels Bohr
Bohr created a model of the atomic structure which become the base of the quantum theory. He discovered he electron and radioactivity. He also responsible for peaceful applications of atomic energy across the world. His research lead him to theorise that atoms give off electromagnetic radiation because of electrons jumping to different orbit levels.
SOURCES:
http://www.nobelprize.org/nobel_prizes/physics/laureates/1922/bohr-facts.html
http://www.biography.com/people/niels-bohr-21010897#early- -
Francis Aston
Francis discovered the evdience of 2 isotopes of the inert gas neon. He invented the mass spectograph which he used to find 112 naturally occuring isotopes. Francis was the founder of the Whole Number Rule. This rule states that the mass of an oxygen isotope is 16 and all isotopes are equal to whole numbers.
SOUCRES:
www.nobelprize.org
www.chemistry.about.com/od/famousscientists/p/francis-aston.bio.htm -
J.J Thomson
J.J Thomson demonstrated that catcode rays were actually speedily moving particles. He found that electrons are 2000 times smaller in mass compared to the lightest know particle. He also helped in the discovery of isotopes
SOURCES:
http://www.famousscientists.org/j-j-thomson/ http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx -
James Chadwick
James Chadwick researched in the nuclear physics area. He believed that particles with no charge could be in the nucles. He was also convinced in the existence of a neutron. He, however had no evidence to back him up. James could show that in the reaction, a neutral particle with a mass about that of a proton, was emitted After a lot of research he discovered a neutron.
SOURCES:
http://www.nobelprize.org/nobel_prizes/physics/laureates/1935/chadwick-facts.html
http://www.famousscientists.org/ -
Murray Gell-Mann
Murray introduced the concept of “strangeness”. This meas that forces hold the components of the atomic nucleus together. He aslo discovered the omega-minus particle. Murray's hard work also lead to the discovery of omega-minus particle.
SOURCES:
http://www.famousscientists.org/murray-gell-mann/ http://www.nobelprize.org/nobel_prizes/physics/laureates/1969/gell-mann-bio.html -
John Dolton
John was able to explain the shortage in colour preseption, He produced a gas law known as 'Dalton's Law' Which tells us that the total pressure of a gaseous mixture is equal to the sum of particle pressure. John calculated the atomic weights of elements and out them in a table. he was also able to explain the behaviour of atoms in terms of weight
SOURCES:
www.famousscientists.org
www.biography.com/people/john-dolton-926520/#earlylife-and-carrer
