Ch. 2.3 - The Periodic Table I. History
A. Mendeleev Dmitri Mendeleev (1869, Russian) Organized elements by increasing atomic mass. Elements with similar properties were grouped together. There were some discrepancies.
A. Mendeleev Dmitri Mendeleev (1869, Russian) Predicted properties of undiscovered elements.
B. Moseley Henry Mosely (1913, British) Organized elements by increasing atomic number. Resolved discrepancies in Mendeleev’s arrangement.
II. Organization of the Elements Ch. 2.3 - The Periodic Table II. Organization of the Elements
A. Metallic Character Metals Nonmetals Metalloids
B. Blocks Main Group Elements Transition Metals Inner Transition Metals