Dmitri Ivanovich Mendeleev and Julius Lothar Meyer.
Confidence votes 1.1K. .In 1869 the Russian chemistry professor Dmitri Ivanovich Mendeleev and four months later the German Julius Lothar Meyer independently developed the first periodic table, arranging the elements by mass. its invention though is generally credited to Russian chemist Dmitri Mendeleev. Although Dmitri Mendeleev is often considered the father of the periodic table, the work of many scientists contributed to its present form.   In the Beginning   A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements. The periodic table is an arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations and recurring chemical properties. Elements are presented in order of increasing atomic number. The standard form of the table consists of a grid of elements, with rows called periods and columns called groups. A few months after Mendeleev published his periodic table of the known elements, predicted new elements to help complete his table and corrected the atomic weights of some of the elements, Meyer published a virtually identical periodic table. 1 Once again, the elements were arranged in order of increasing atomic weights. 2  Also in 1869, Russian chemist Dmitri Mendeleev produced a periodic table based on atomic weights but arranged ‘periodically’. 3  Elements with similar properties appeared under each other. 1 Certain ‘threes’ of elements with similar properties came together down the cylinder. 2  He called his model the ‘telluric screw’. 3  In 1864, English chemist John Newlands noticed that, if the elements were arranged in order of atomic weight, there was a periodic similarity every 8 elements. The Russian chemist Dmitri Mendeleev was the first scientist to make a periodic table similar to the one used today. Mendeleev arranged the elements by atomic mass, corresponding to relative molar mass. A few months after Mendeleev published his periodic table of the known elements, predicted new elements to help complete his table and corrected the atomic weights of some of the elements, Meyer published a virtually identical periodic table. Chemist for uranium nuclear fuels. SCIENTISTS WHO CONTRIBUTED to the DEVELOPMENT OF PERIODIC TABLE ARE DMITRI MENDELEEV, JOHN DALTON, Johann Dobereiner, John Newlands, Julius Lothar Meyer, etc. Dmitri Mendeleev Dmitri Mendeleev Dmitri Mendeleev is the scientists that worked with decks of cards  to decelop the arrangement of elements on the periodic table in the  18 … 60's. Scientists use the Periodic Table in order to find out important information about various elements. Created by Dmitri Mendeleev (1834-1907), the periodic table orders all known elements in accordance to their similarities. When Mendeleev began grouping elements, he noticed the Law of Chemical Periodicity. This law states, the properties of the elements are periodic functions of atomic number.. Newlands' Periodic Table. An English scientist called John Newlands put forward his law of octaves in 1864. He arranged all the elements known at the time into a table in order of relative atomic mass. When he did this, he found that each element was similar to the element eight places further on. For example, starting at Li, Be is the second element, B is the third and Na is the eighth element. Regular repeats Newlands ' table showed a repeating or periodic pattern of properties, but it had problems. For example, he put iron in the same group as oxygen and sulphur, which are two non-metals. As a result, his table was not accepted by other scientists. While many people are aware of Meyer's contribution to the understanding of element periodicity and the development of the periodic table, many have not heard of Alexandre-Emile Beguyer béguyer De. chancourtois De chancourtois was the first scientist to arrange the chemical elements in order of their atomic. weights Answer: If you answered Dmitri Mendeleev then you might be incorrect. Dmitri Mendeleev presented his periodic table of the elements based on increasing atomic weight on March 6, 1869, in a presentation to the Russian Chemical Society. While Mendeleev's table was the first to gain some acceptance in the scientific community, it was not the first table of its kind.
http://www.answers.com/Q/Who_were_the_2_scientists_that_completed_the_periodic_table_what_did_they_do https://en.wikipedia.org/wiki/History_of_the_periodic_table http://sciencelearn.org.nz/Contexts/Just-Elemental/Looking-Closer/Development-of-the-periodic-table https://en.wikipedia.org/wiki/History_of_the_periodic_table http://www.answers.com/Q/Who_are_the_scientist_and_their_contribution_in_development_of_periodic_table http://www.shodor.org/unchem/basic/atom/index.html http://www.corrosion-doctors.org/Periodic/Periodic-Newlands.htm http://chemistry.about.com/od/periodictableelements/f/who-invented-the-periodic-table.htm
state the names of two scientists who helped develop the periodic table