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Chapter 5 sec 1 The Periodic Table -Organizing the Elements
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Searching for an Order Until the 1750’s scientists had only identified 17 elements. What were they mainly? Metals Copper, Iron French Chemist Antoine Lavoisier grouped the elements into categories Metals, Nonmetals, Gases, Earths
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Searching for an Order After 80 years, of trying to group elements, Russian Chemist discovered a system Dmitri Mendeleev Proposal: Modeled after his favorite Card game, Solitaire Each Element was given a “card” He then watched how elements reacted to hydrogen and Oxygen
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Mendeleev Arranged elements in atomic mass. Periodic properties repeating properties of physical & chemical properties. Periodic Table: Arrangement of elements in columns, based on set properties that repeat row to row
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Mendeleev’s Table
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Mendeleev Prediction: Not full table, too many undiscovered elements Had to leave 4 spaces between Bromine & Zinc Only had Arsenic & Selenium to fill Left spaces Evidence: Close match between predictions and properties of elements showed value for the table
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