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Mendeleev & The Periodic Table

Learn about Mendeleev's organization of elements based on increasing atomic mass and how he made successful predictions about new elements. Discover the usefulness of his periodic table and the evolution of the table over time.

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Mendeleev & The Periodic Table

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  1. Mendeleev & The Periodic Table

  2. Increasing Atomic Mass Similar Chemical Properties

  3. Mendeleev’s Table • Organized elements by increasing atomic mass so that elements with similar chemical properties were in the same column.

  4. Mendeleev’s Prediction • After Mendeleev placed all the known elements in his periodic table, several empty spaces were left. • In 1871 Mendeleev predicted the existence and properties of elements that would fill three of the spaces. • By 1886, all three of these elements had been discovered.

  5. Mendeleev’s Prediction • Predicted Eka-aluminum in 1871 • Soft metal • Low melting point • Density of 5.9 g/cm3 • Found: Gallium in 1875 • Soft metal • Melting Point29.7 C • Density of 5.91 g/cm3

  6. Mendeleev’s Predictions

  7. Usefulness of His Table • The close match between Mendeleev’s prediction and the actual properties of new elements showed how useful his periodic table could be.

  8. Henry Moseley (1913, British) • Organized elements by increasing atomic number. • Fixed the elements that Mendeleev had to switch based on atomic mass. • Now, no elements were out of order.

  9. ChemCatalyst • The atomic mass of silver is 107.9 amu. The atomic mass of gold is 197.0 amu. Where would you place these elements on the periodic table you created in Lesson 9: Create a Table? Explain your reasoning.

  10. The card sort table can be opened up to accommodate more elements.

  11. Evolution of the Periodic Table

  12. Add Mendeleyev’s remaining elements.

  13. Check-in Which of these elements would be grouped together on the periodic table? Explain your thinking.

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