7 Answers | Add Yours
The first records of an organized was sometime around 1870s. Dimitri Mendeleev and Lothar Meyer working independently developed the first ideas of a geometric presentation of the elements that organized them according to physical and chemical properties. It seems that over time, Mendeleev's tool held sway and has been continued to be developed over the last 140 years.
Mendeleev organized his table in order of increasing atomic mass and then grouped them together according to similar chemical and physical properties. Doing so he noted that there were gaps in the table where he predicted other to date unknown elements would one day be discovered. Subsequent forms of the Periodic Table have been ordered based on atomic number (that is, the number of protons in an element's nucleus) and arranged such that columns of elements have similar chemical and physical properties.
As was predicted, every naturally occuring element with atomic numbers of 1 through 92 have been discovered along with an additional 116 man-made elements.
Dimitri Mendeleev developed the periodic table around 1869.
The Periodic Table was developed by Dmitri Mendeleev.
Dmitri Ivanovich Menseleev who is a Russian chemist and inventor developed the Periodic Table.
Dmitri Ivanovich Mendeleev was the one who developed the periodic table and also he correctly predicted the undiscovered elements and their locations of the Periodic Table.
Dmitri Mendeleev developed the periodic table.
Russian chemist Dmitri Ivanovich Mendeleyev (1834-1907) developed the periodic table. (A chemist is a scientist specializing in the composition, structure, properties, and reactions of matter.) The periodic table is the table in which chemical elements are arranged by their atomic numbers. (Elements are pure substances that cannot be broken down into anything simpler by ordinary chemical means. An atomic number is the number of protons in an atomic nucleus.) Mendeleyev was the first to illustrate the similarities and trends in the properties of chemical elements. His nomination for the 1906 Nobel Prize for chemistry failed by one vote. However, his contribution to the field of chemistry was acknowledged fifty years later when the one-hundred-first element was named mendelevium.
Mendeleyev's periodic table originally ordered the elements according to their atomic weights (the average weight of an atom of an element); in the 1920s the ordering was changed to correspond to atomic number. Mendeleyev's table consisted of the 63 elements that were known at the time. Mendeleyev left gaps in the table and predicted that new elements would eventually be discovered to fill in those gaps. Three new elements were discovered in Mendeleyev's lifetime: gallium, scandium, and germanium.
There are now 109 elements listed on the periodic table. Of those, 94 are naturally occurring; whether the other 15 elements occur in nature is a matter of debate. By 1984, over 6.8 million chemical compounds had been produced from these 109 elements; 65,000 of them are in common use.
Sources:The Guinness Book of Records 1994, p. 74; Hawley's Condensed Chemical Dictionary, 12th ed., end paper; Porter, Roy, ed. The Biographical Dictionary of Scientists, 2nd ed., pp. 475-77.
We’ve answered 317,422 questions. We can answer yours, too.Ask a question