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10 chemists and their contributions to the periodic table

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Adam Jones

on 18 February 2014

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Transcript of 10 chemists and their contributions to the periodic table

10 chemists and their contributions to the periodic table
By Adam Jones
Hennig Brand
Hennig brand is a german chemist who was the first discoverer of an element through his discovery of phosphorus around 1669. He discovered phosphorus by heating residues from boiled down urine.
Antoine Lavoisier
Antoine discovered the role the oxygen plays in combustion, he also recognized and name the elements oxygen and hydrogen. He discovered many elements, helped create the metric system and formulated basic law of chemistry. He is regarded as one of the most important scientists in the history of chemistry. He discovered that in chemical reactions the total mass is always the same. This is called the law of conservation of mass
Johann Wolfgang Döbereiner
Johann discovered trends in certain properties of selected groups of elements. example is a pattern found between strontium barium and calcium. The sets of elements were known as Dobereiner triads. Dobereiner discovered that the relative atomic mass of the middle element in each triad was close to the average of the relative atomic masses of the other two elements.
Alexandre-Emile Béguyer de Chancourtois
Alexandre-Emile was the first to arrange the chemical elements based on their atomic weights. He drew the elements as a continuous spiral, similar elements lined up with each other.
John Newlands
John devised a periodic table, arranging elements in order of their relative atomic mass. He continued Johann's work on triads. The elements were ordered based on their known atomic weight at the time. He stated the elements repeat their chemical properties every eight elements.
Dmitri Mendeleev
Dmitri was a Russian scientist, He was the first person to develop a periodic table (released 1669) similar to the one used today. He arranged elements by their atomic mass and relative atomic mass. He corrected already discovered elements and was able to perdict elements, he left space on the table so that new elements that were discovered didn't affect or change the table.
Lothar Meyer
Lothar was also working on a periodic table, Meyer's table included 28 elements, they were classified by valence not by atomic weight. People believe that Mendeleev and Meyer are co creaters of the periodic table but Mendeleev was able to perdict elements so he was given more credit.
William Odling
William drew up a table almost the same as Mendeleev. Odling overcame problems that Mendeleev couldnt on his first attempt. Odling corrected elements into their proper groups. He didnt receive any recognition for all the work he did.
Henry Moseley
Henry was an English physicist, he found a relationship between an elements atomic number and xray wavelength of the element. Using this information Henry moved elements around in the periodic table based on it atomic number. He predicted missing elements based on the missing atomic numbers.
Glenn T. Seaborg
Glenn discovered actinide series after experiencing trouble isolating americium and curium, he noticed that they had different chemical properties. He proposed a change to Mendeleev's table in 1945. He co discovered 10 different elements. He identified and isolated transuranium elements.
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