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Development of the periodic table
03/11/2022
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. DEVELOPMENT of periodic table Johann Döbereiner noticed elements with similar chemical properties often occurred in inrees (triads) eg lithium, sodium & potassium Newlands-octaves 40 yrs later he arranged the elements in order of increasing. atomic weight. saw every 8th element reacts in a similar way read Leg Lithium, soalum and potassium benave similary. Dimitri Mendeleev. created the first modern periodic table started by arranging all elements in increasing atomic weight ne switched the order of specific elements so they fitted. the patterns of other elements in the same group. left gaps for undiscovered elements. ↳ ne also predicted the properties of the undiscovered elements based on other elements in the group Years later elements were discovered, matching his predictions Modern periodic table. elements arranged in order of atomic number has group o: the noble gases. elements with similar properties are placed in groups. PIT
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