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By groups and periods , groups are are vertical and periods horizontal

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The periodic table  is one of the most valuable tools for chemists and other scientists because it orders the chemical elements in a useful way.

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Once you understand how the modern periodic table is organized, you'll be able to do much more than just look up element facts like their atomic numbers and symbols.

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It is a table with different chemical elements with different types of risk etc.

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Dimitri Mendeleev made the first periodic table

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In the elements it also contains the atomic number, symbol, atomic weight,etc.

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There are elements that make compounds

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Mendeleev’s table has become as familiar to chemistry students as spreadsheets are to accountants. It summarizes an entire science in 100 or so squares containing symbols and numbers.

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After receiving an education in science in Russia and Germany, Dmitri Mendeleyev became a professor and conducted research in chemistry. Mendeleyev is best known for his discovery of the periodic law, which he introduced in 1869, and for his formulation of the periodic table of elements. He died in St. Petersburg, Russia, on February 2, 1907.

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By early 1869, Mendeleev had made enough progress to realize that some groups of similar elements showed a regular increase in atomic weights.

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As a professor, Mendeleyev taught first at the St. Petersburg Technological Institute and then at the University of St. Petersburg, where he remained through 1890. Realizing he was in need of a quality textbook to cover the subject of inorganic chemistry, he put together one of his own, The Principles of Chemistry.

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As a professor, Mendeleyev taught first at the St. Petersburg Technological Institute and then at the University of St. Petersburg, where he remained through 1890. Realizing he was in need of a quality textbook to cover the subject of inorganic chemistry, he put together one of his own, The Principles of Chemistry.

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The elements of same groups share the same number of valance electrons

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It is believes that Dimitri was capable of creating the first periodic table in a single day.

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The periodic table was created the 17 of February of 1869 of the Russian calendar which means March 1 in most of the world.

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It is a table that contains the different chemical elements that exists

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It has the chemical elements arranged in groups depending in the type of elements (metal, non-metals,etc.)

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Even tho the periodic table came all together in one day Dimitri had the idea of grouping the elements for years before he finally did it

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Before Dimitri some scientists had the idea of grouping, for example Döberenier.

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Döbereiner noticed peculiarities in groupings of elements, but in those days the chemists hadn’t fully grasped the nature of atoms

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But the previous research like for example Dalton’s theory helped and contributed to the creation of the periodic table because it provided the information that it is now included in the table.

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Some scientists tried to creat groups with the element but were missing information

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At first, Mendeleyev's system had very few supporters in the international scientific community. It gradually gained acceptance over the following two decades with the discoveries of three new elements that possessed the qualities of his earlier predictions. In London in 1889, Mendeleyev presented a summary of his collected research in a lecture titled "The Periodic Law of the Chemical Elements." His diagram, known as the periodic table of elements, is still used today.

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At first, Mendeleyev's system had very few supporters in the international scientific community. It gradually gained acceptance over the following two decades with the discoveries of three new elements that possessed the qualities of his earlier predictions. In London in 1889, Mendeleyev presented a summary of his collected research in a lecture titled "The Periodic Law of the Chemical Elements." His diagram, known as the periodic table of elements, is still used today.

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While he was researching and writing that book in the 1860s, Mendeleyev made the discovery that led to his most famous achievement. He noticed certain recurring patterns between different groups of elements and, using existing knowledge of the elements' chemical and physical properties, he was able to make further connections.

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He systematically arranged the dozens of known elements by atomic weight in a grid-like diagram; following this system, he could even predict the qualities of still-unknown elements. In 1869, Mendeleyev formally presented his discovery of the periodic law to the Russian Chemical Society.

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Many chemists perceived links between atomic weights and chemical properties.

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In the later years of his career, Mendeleyev was internationally recognized for his contributions to the field of chemistry. He received honorary awards from Oxford and Cambridge, as well as a medal from the Royal Society of London.

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Even with the existence of the elements the rest of the information like the atomic number and atomic weight of many elements wasn’t known or wasn’t correct yet so other scientists wouldn’t have been capable of doing the periodic table.

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Mendeleyev died on February 2, 1907. At his funeral in St. Petersburg, his students carried a large copy of the periodic table of the elements as a tribute to his work.

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Mendeleyev was married twice, to Feozva Nikitichna Leshcheva in 1862 and to Anna Ivanova Popova in 1882. He had a combined six children from those two marriages.

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He spent most of the years 1859 and 1860 in Heidelberg, Germany, where he had the good fortune to work for a short time with Robert Bunsen at Heidelberg University. In 1860, Bunsen and his colleague Gustav Kirchhoff discovered the element cesium using chemical spectroscopy – a new method they had developed, which Bunsen introduced Mendeleev to.

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Each atom type contains the same number of protons.

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Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table.
Atomic number increases as you move down a group or across a period.

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The periodic table is organized like a grid.Understanding how the elements are organized in the grid may help you to learn the periodic table.

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I know that the periodic table is very importante in chemistry

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He structured his thinking by writing each of the 63 known elements properties on an individual note card

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Atoms are the basic units of matter and the defining structure of elements.

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I know that are metals and  non metals

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Arranging the cards in vertical columns from lower to higher atomic weights placed elements with similar properties in each horizontal row. Mendeleev’s periodic table was born

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The periodic table  of elements arranges all of the known chemical elements in an informative array.

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Elements are arranged from left to right and top to bottom in order of increasing atomic number.

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Order generally coincides with increasing atomic mass. The rows are called periods.

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“All the comparisons which i have made...lead me to conclude that the size of the atomic weight determines the nature of the elements”.

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The position of each of the elements is not at all random  but due to its atomic structure.

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Meanwhile, the German chemist Lothar Meyer had also been working on organizing the elements. He prepared a table similar to Mendeleev’s, perhaps even before Mendeleev did. But Mendeleev published first.

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When it came to atomic weight it took longer to figure it out because the used method was Newland’s method but Dimitri soon realized that this method wasn’t correct.

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More important than beating Meyer to the publication punch, though, was Mendeleev’s use of his table to make bold predictions about undiscovered elements.

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When Dimitri finally had all the information he required he made the periodic table,  but he left a few holes in it so other scientists after that kept adding new elements as they found them.

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I learned who is dimitri

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In preparing his table, Mendeleev had noticed that some note cards were missing. He had to leave blank spaces to get the known elements to properly align. Within his lifetime, three of those blanks were filled with the previously unknown elements gallium, scandium and germanium.

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Not only had Mendeleev predicted the existence of these elements, but he had also correctly described their properties in detail

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I learned who create the periodic table

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Paula Acosta
Camila Álvarez
Iñaki Fonseca
Santiago Castellanos
G.13

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Atoms are the basic units of matter and the defining structure of elements.

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Mendeleev’s table had become an oracle. It was as if end-of-game Scrabble tiles spelled out the secrets of the universe. While others had glimpsed the periodic law’s power, Mendeleev was the master at exploiting it.

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I learned more about the periodic table

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By the 1890s, chemists widely recognized his law as a landmark in chemical knowledge. In 1900, the future Nobel chemistry laureate William Ramsay called it “the greatest generalization which has as yet been made in chemistry.” And Mendeleev had done it without understanding in any deep way why it worked at all.

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I learned how the periodic table it’s organized

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I learned that the periodic table is not the work of only one person, but the work of many different scientists put together

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I learned about atoms

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I learned about atoms  are the basic units of matter and the defining structure of elements.

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I learned about all the effort and different ideas, methods, scientists and theories  that it took to creat a single table

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I learned the history of the periodic table

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I learned how a man made The bases of chemist as we know nowadays

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I learned about elements and compounds

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Every compound has elements