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Created with Fabric.js 1.4.5 Ancient Civilizations A. E. Beguyer de ChancourtoisFrench geologist People were aware of elements such as gold (Au), silver (Ag), copper (Cu), lead (Pb), tin (Sn), and mercury (Hg). 1817-1829 Lothar MeyerGerman chemist 1862 1941 - identifies Pu1942 - joins Manhattan Project1944 - identifies Am - develops actinide concept He discovered the transuranium elements, (94 to 102).This led to the redesign of the periodic table into itscurrent form. Lanthanide and actinide series are placed under the rest of the periodic table to make it more compact. Element Discoveries Published: "On the Relationship of the Properties of the Elements to their Atomic Weights" 1863 John NewlandsEnglish chemist His 1864 textbook had an abbreviated version of a periodic table used to classify about half of the known elements.In 1868, he made an extended table which he gave to a colleague for evaluation. This table was not published until 1870, a year after Mendeleev's table was published. 1864 Glenn SeaborgAmerican He predicted the existence and properties of unknown elements which he called eka-aluminum, eka-boron, and eka-silicon.Gallium, scandium and germanium were discovered later and fit in the missing spaces in his periodic table. Todayarranged by atomic number 1649 Johann Dobereiner German chemist 1869 Dmitri Ivanovich MendeleevRussian chemist History of the Periodic Table Hennig Brand German alchemist He grouped elements with similar properties into triads (groups of 3).He noticed that the atomic weights of strontium (Sr) was halfway between the weights of calcium and barium, and they had similar properties. By 1829, he found a halogen triad (Cl, Br, I) and a alkali metal triad (Li, Na, K). He observed triads of elements existed where the middle elementhad properties that were an average of the other two elements.aka: Law of Triads Discovers Phosphous (P)1st "discovered" element He proposed the Law of Octaves - elements repeated their chemical properties every 8th element. 1735 Co Georg Brandt Swedish 1751 Ni Axel Fredrik Cronstedt Swedish1755 Mg Joseph Black Scottish1766 H Henry Cavendish English1772 N Daniel Rutherford Scottish1772/4 O Karl Wilhelm Scheele Swedish Joseph Priestley English1774 Cl Karl Wilhelm Scheele Swedish1774 Mn Johann Gottlieb Gahn Swedish1780 Cr Louis-Nicholas Vauquelin French1781 Mo Peter Hjelm Swedish1783 Te Franz Müller von Reichenstein Hungarian1783 W Juan & Fausto Elhuyar Spanish1787 Sr Adair Crawford Scottish1791 Sr Thomas Charles Hope German 1808 Sr Humphery Davy (isolated) English1789 Zr Martin Heinrich Klaproth German1794 Y Johan Gadolin Finnish1797 Be Vauquelin French1801 V Nils Gabriel Sefström Swedish Nb Charles Hatchett English1802 Ta Anders Gustaf Ekeberg Swedish1803 Rh William Hyde Wollaston English Pd William Hyde Wollaston English Os Smithson Tennant English In Smithson Tennant English Ce Jöns Jacob Berzelius Swedish Wilhelm Hisinger Swedish1807 K Humphry Davy English Na Humphry Davy English1808 B Louis-Josef Gay-Lussac French Louis-Jacques Thenard French Ca Humphry Davy English Ba Humphry Davy English Ru Karl Klaus Russian1811 I Bernard Courtois French1815 Th Jöns Jacob Berzelius Swedish1817 Li Johan August Arfvedson Swedish Se Jöns Jacob Berzelius Swedish Cd Friedrich Strohmeyer German1824 Si Jöns Jacob Berzelius Swedish1825 Al Hans Christian Øersted Danish1825/6 Br Carl Löwig German Antoine-Jérôme Balard French1828 Be Friedrich Wöhler isolated German Be Antoine-Alexander-Brutus Bussy French 1839 La Carl Mosander Swedish1841 U Eugène Péligot isolated French1842 Er Carl Mosander Swedish1843 Tb Carl Mosander Swedish1860 Cs Robert Bunsen & Gustav Kirchhoff German1861 Rb Robert Bunsen & Gustav Kirchhoff German Tl William Crookes English1863 In Ferdinand Reich German Hieronymus Richter German1868 He Pierre Jules César Janssen French Joseph Norman Lockyer English He was the first person to use atomic weightsto organize the element with similar properties. The elements were arranged in a spiral around a cylinder divided into 16 parts-first geometric representation of periodic law Arranged by: Mrs. Clarici
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