![]() We created a timeline of the history of the periodic table. The Periodic Table has constantly been improved and developed over the past 200 years, but in 1869 Dimitri Mendeleev finished the first version of the periodic table as we know it today, by arranging the elements by atomic mass and leaving spaces open for the elements that were not yet discovered. Who invented the Periodic Table of Elements? D He organized the elements by their atomic number. C He arranged the elements by different properties to find a pattern. B He estimated the number of electrons in atoms of each element. The periodic table also gives us an idea of what the characteristics of an element might be and help us predict how an element might react based on in which group it is located. How did Mendeleev come up with the first periodic table of the elements (1 point) A He determined the mass of atoms of each element. The Periodic Table of Elements can be used as an assisting tool in chemical calculations, when a specification of an element is needed it is easily found in the Periodic Table. This table is optimized to fit on a single sheet of 8 1. From top to bottom, each tile contains the element’s number, symbol, name, and atomic mass. The key beneath the table shows which color corresponds to which element group. How is the Periodic Table of Elements used? Each element tile is lightly colored to identify the element’s group. The table lists all the elements that are currently known (118), in descending order of the number of protons that are present, in a single atom of the element. The Periodic table of elements is a tool, developed by scientists over hundreds of years. White for hydrogen Black for carbon Blue for nitrogen Red for oxygen Deep yellow for sulfur Purple for phosphorus Light, medium, medium dark, and dark. Formulas indicate the type of compounds formed by each group, with R standing for any element and superscripts. The column headings Reihen and Gruppe are German for row and group. List of all the elements and their properties: 1 Mendeleev’s Periodic Table, as Published in the German Journal Annalen der Chemie und Pharmacie in 1872.
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