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Chapter 6 The Periodic Table

Chapter 6 The Periodic Table. The how and why. History. 1829 German J. W. Dobereiner Grouped elements into triads Three elements with similar properties Properties followed a pattern The same element was in the middle of all trends Not all elements had triads. History.

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The Periodic Table and Trends Topics 3.1 - 3.3 and 12.1.1 - 12.1.2

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Chapter 6 The Periodic Table

Chapter 6 The Periodic Table. The how and why. History. 1829 German J. W. Dobereiner Grouped elements into triads Three elements with similar properties Properties followed a pattern The same element was in the middle of all trends Not all elements had triads. History.

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Periodic Trends

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1/8/09 Warm Up:

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Topic 3: Periodicity

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Unit 5: Periodicity

Unit 5: Periodicity. Cartoon courtesy of NearingZero.net. History. Russian scientist Dmitri Mendeleev taught chemistry in terms of properties. Mid 1800 - molar masses of elements were known. Wrote down the elements in order of increasing mass. Found a pattern of repeating properties.

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Periodicity

Periodicity. Periodic table and its importance. Elements are arranged in order of increasing atomic number and there is a periodicity in their physical and chemical properties. Atomic number (no. of electron). A. X . Z. Mass number (no. of neutron + proton).

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