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Evolution of the Periodic Table: From Mendeleev to Modern Classification

Explore the journey of the Periodic Table from Mendeleev's groundbreaking organization by atomic mass to Moseley's refinement based on atomic number. Discover how elements with similar properties are grouped and learn about metallic character, blocks, and the organization of elements.

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Evolution of the Periodic Table: From Mendeleev to Modern Classification

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  1. Ch. 5 - The Periodic Table I. History(p. 123 - 127) C. Johannesson

  2. A. Mendeleev • Dmitri Mendeleev (1869, Russian) • Organized elements by increasing atomic mass. • Elements with similar properties were grouped together. • There were some discrepancies. C. Johannesson

  3. A. Mendeleev • Dmitri Mendeleev (1869, Russian) • Predicted properties of undiscovered elements. C. Johannesson

  4. B. Moseley • Henry Mosely (1913, British) • Organized elements by increasing atomic number. • Resolved discrepancies in Mendeleev’s arrangement. C. Johannesson

  5. Ch. 5 - The Periodic Table II. Organization of theElements C. Johannesson

  6. A. Metallic Character • Metals • Nonmetals • Metalloids C. Johannesson

  7. B. Blocks • Main Group Elements • Transition Metals • Inner Transition Metals C. Johannesson

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