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Contributions to the Atomic Theory

Descriptions of the People who Contributed to the Atomic Theory
by Justin Leonard on 16 March 2011

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Transcript of Contributions to the Atomic Theory

Henry Moseley Moseley was an English physicist
born on November 23, 1887. Both Moseley's father and grandfather were biologist and very respected in the scientific community. Moseley contributed to the atomic theory by demonstrating that atomic numbers were not arbitrary but had a physical basis that could be measured. JJ Thomson Joseph John Tomson was born on December 18, 1856 in Cheetham Hill, a suburb of Manchester. Thomson attended Owens College, Trinity College, and became a legendary professor at Cambridge University. Thomson identified that electrons inside an atom were not invisible and stated that an atom was shaped like a sphere with electrons surrounding it. Ernest Rutherford Ernest Rutherford was born on August 30, 1871 in Nelson, New Zealand. At 16, Rutherford entered Nelson Collegiate School where he then recieved a scholarship to the University of New Zealand. Rutherford described the atom as having a central positive nucleus surrounded by orbiting, negative electrons. Robert Millikan Robert Millikan was born on March 22, 1868 in Morison, Illinois. Millikan attended Oberlin College and then obtained professorship at Columbia Univerisity. Millikan discovered that the weight of an electron is 1836 times smaller than that of a hydrogen atom. John Dalton John Dalton was born September 6, 1766 in Cumberland, England. Dalton attended a Quaker school called Kendal. He then moved to Manchester to attend the "New College". Dalton originally discovered the atomic theory when he discovered color blindness. Antoine Lavoisier Antoine Lavoisier was born on August 26, 1743 to a wealthy family in Paris, France. Lavoisier attended College Mazarin studing chemistry, botany, astronomy, and mathematics. Lavoisier contributed to the atomic theory by discovering the role that oxygen plays in combustion. Democritius This ancient Greek philosopher was born in 460 B.C. in Abdera, Thrace, Greece. Democritius was a very gifted man and ended up traveling around the world spreading his knowledge about science and math. He was one of the first people to contribute to the atomic theory by formulating the atomic theory for cosmos. Benjamin Franklin Benjamin Franklin was born January 17, 1706 in Boston, Massachusetts. Franklin was one of the founding fathers of the United States as well as a genius in almost every subject. Franklin calculated the size of an atom before the idea of the molecular theory existed by measuring ripples off a lake surface from a drop of oil. Neils Bohr Neils Bohr was born on October 7, 1885 in Copenhagen. Bohr became a professor at Copenhagen University where he excelled in physiology. Bohr contributed to the atomic theory by investigating the atomic structure in an atom.
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