Created by oliviaa on Oct 8, 2010
Last updated: 10/08/10 at 01:23 PM
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Glenn Theodore Seaborg (America: April 19, 1912 - February 25, 1999) is known for identifying over 10 isotopes of elements in the periodic table. He is also credited for discovering transuranium elements (elements which have an atomic number greater than 92.)
Erwin Schrodinger (Austria: August 12, 1887 - January 4, 1961) is famous for developing wave mechanics. His solution for the wave equation was that they can only be related physically. He also developed an equation now called the Schrodinger equation to help get a better idea of atoms. The equation lets you predict the reactivites and properties of atoms.
Werner Heisenberg (Germany: December 5, 1901 - February 1, 1976) theory of quantum mechanics was based on the radiation given off by atoms. He said that electron’s position in space can be determined not by “ordinary numbers” but by a complicated equation.
Neils Henrik David Bohr (Denmark: October 7, 1885 - November 18, 1962) is known for working with atoms and discovering that electrons were found on different energy levels. He also said that the electrons were found at set distances from the nucleus.
Henry Moseley (England: November 23, 1887 - August 10, 1915) well known for his work on arranging the elements in the periodic table in order of atomic number. He was able to do this by using x-rays to measure the spectral line of elements aluminum to gold.
Ernest Rutherford (New Zealand: August 30, 1871 - October 19, 1937) discovered that atoms contain a nucleus and that in the nucleus there are protons. He also worked with radioactivity and discovered that atoms which are radioactive can change into other atoms. This created the idea of isotopes. He looked at magnetic properties of iron and also invented a device which detects electromagnetic waves and he looked at the reactions and behaviors of ions in gasses.
Joseph John Thomson (England: December 18, 1856 - August 30, 1940) discovered the electron. During 1906 he discovered that a hydrogen atom contained only 1 electron.
Julius Lothar Meyer (Germany: August 19, 1830 - April 11, 1895) created a chart which plotted the atomic weight as compared to the atomic volume. He realized that the volume measured for each atom should be the same as the relative volume.
Dmitri Mendeleyev (Russia: February 8, 1834 - February 2, 1907) is well known for his work on organizing the elements in the periodic table in order of atomic weight but also for grouping them with similar properties.
John Alexander Reina Newlands (England: November 26, 1837 - July 29, 1898) created the “Law of Octaves”. This noticed the patterns in the atomic structure of elements whose properties were similar. It was named the "Law of Octaves" because when the elements were grouped the eigth element was similar to the first element just like the eigth note in a scale in music is the same as the first.
Alexandre- Emile Béguyer de Dechancourtois (France: January 20, 1820 - November 14, 1886) was the first chemist to arrange all the elements in the periodic table in order of atomic mass. He created something called a “Vis Tellurique” or spiral graph to show where the elements were going up in mass.
Stanislao Cannizzaro (Italien: July 13, 1826 - May 10, 1910) discovered that when potassium hydroxide comes in contact with benzaldehyde it goes through a process of oxidation-reduction. This finding is helpful when studying or researching synthetic organic chemistry.
Johann Wolfgang Doberiner (Germany: December 13, 1780 - March 24, 1849) realized that there was a relationship between the chemical property and the atomic weight. He talked about a Law of Triads which is basically saying that the middle element in a group of 3 elements has an atomic mass which is the average of the other 2 elements in its group. This law helped to organize elements.
John Dalton (England: September 6, 1766 - July 27, 1844) showed through experiments with gasses that the weights of elements follow a pattern that are arranged on the periodic table. From this experiment he was able to discover that matter is made up of atoms.
Antoine Laurent Lavoisier (France: August 26, 1743 - May 8th, 1794) named oxygen and hydrogen. He also realized that the weight of an element still stayed the same even after a chemical reaction took place. Through experiment he found that oxygen was needed in combustion.
Democritus (Greece: 460BC-370BC) created the theory that all things on earth were made up of particles of atoms. He also said that changes in the world were created by changes in atoms.
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