A long time
Dmitri Mendeleev is credited with the creation of the modern periodic table in 1869. He arranged the elements based on their atomic mass and properties, predicting the existence of yet-to-be-discovered elements and leaving gaps for them in the table.
There are lots of long-bearded Russians, but the one you're probably thinking of is Dmitri Mendeleev. He came up with the whole idea of the Periodic Table of the Elements back in the 1800's, and he is honored today for this achievement by having the element Mendelevium (Md, #101) named for him.
Dmitri Mendeleev, the Russian chemist known for creating the periodic table, did not have a formally assessed IQ level, as standardized IQ tests were developed long after his time. However, he is often regarded as a genius due to his profound contributions to science and his ability to predict the properties of undiscovered elements. His intellectual achievements suggest he possessed exceptional cognitive abilities.
someone else probably would have by now, although depending on how long it took, modern science could be set back years
I think five years.
British chemist, John Newlands had the idea of arranging chemical elements in order of their relative atomic masses and he arranged his elements in columns. However, Russian chemist, Dmitri Mendeleev greatly improved on Newlands' idea and convinced other chemists to use it, so Mendeleev has been credited with the invention of the periodic tbale...but as of today we are still developing some of hte last elements.... from: "http://inventors.about.com/library/inventors/blperiodictable.htm"
Dmitri Ivanovich Mendeleev -invented the first effective periodic table of elements in 1869was born in Tobolsk on the 8th of February, 1834died in St.Petersburg on the 2nd of February, 1907was the last of 17 children born to Ivan and Mariya Mendeleevgraduated from St. Petersburg Pedagogical Institute 1854contracted tuberculosis in 1855devorced Feozva Leshcheva in 1862 and divorced in 1882became a Professor of Chemistry at St.Petersburg Technical Institute and the State University.married Anna Popova in 1882 and technically became a bigamistwrote many widely acclaimed papers and dissertationswas appointed Director of the Bureau of Weights and Measures in 1893Known for his large beard and long hair.The Element 101 Md (mendelevium) was named after him.His daughters name is Lyubov.
The long dashes on Mendeleev's periodic table represent gaps where elements had not yet been discovered but were predicted to exist based on the periodic pattern of elements. Mendeleev used these gaps to accurately predict the properties of the missing elements, leading to the discovery of new elements.
Dmitri Mendeleev published the first [proper] periodic table in 1869. The last element in period 7 (up to the element with atomic number 118) was confirmed by the International Union of Pure and Applied Chemistry (IUPAC) in December 2015. A total of 146 years. But there may elements in period 8, yet to be synthesised.
Element 101, mendelevium (Md), is named after Dmitri Mendeleev, the Russian scientist who developed the periodic table. Mendelevium is a transuranium element, meaning it has a higher atomic number than uranium, and is synthesized in laboratories as it does not have any stable isotopes.
Mendeleev first created the periodic table in 1869. He thought that the elements must be organised in some way, that we would be able to use for experiments. And he first thought of the periodic table. He tried and tried but could not get them all to fit. He stayed up for hours, until finally giving up late at night. But when he went to bed, he did not know that just hours later, he would make one of the biggest discoveries yet... He went to bed and dreamed about the periodic table. Then, he dreamt of one only possible way too make the elements fit together. He suddenly woke up, and put all his cards in place, and the periodic table was made.
Dmitri Mendeleev developed the periodic table over a period of around 6-7 years from 1869 to 1875. He arranged the elements based on their atomic mass and chemical properties, leaving gaps for undiscovered elements which he predicted would exist.