Chapter 6: The Periodic Table Section 1: Organizing the Elements

Searching for An Organizing Principle By _____ elements discovered ….. Scientist began using ____________ to sort elements into groups.

Searching for An Organizing Principle J.W. Dobereiner, 1829 –classified elements with similar properties in ______ –Example: –Problem: Mendeleev, 1869 –published a table of elements –based on __________ _________ Meyer, 1869 –published a table … –______________ received the credit.

Mendeleev’s Periodic Table Wrote _________ and __________ of known elements on separate cards Arranged cards in order according to ________ ________ Created columns and rows based on __________ __________ Predicted properties of _________ __________ –Ex: Ga, Ge

The Periodic Law Modern Periodic Table –Discovery… –Problem: –Elements are arranged in order of …..

The Periodic Law When elements are arranged in order of increasing ________ __________, there is a periodic repetition of their ________ and __________ properties

The Periodic Law Periods Groups 1. 2.

Metals, Nonmetals, Metalloids Pg. 158, Fig classification systems for the groups: *3.

Three main classes of elements Metals –Good ________ –High _______ –________ light –____________at room temperature (except ________) –Other properties 1. 2.

Three main classes of elements Nonmetals –Physical properties ___________ –Properties opposite of metals –__________ at room temperature (except ________)

Three main classes of elements Metalloids –Properties of both __________ and ______________ –Behavior depends on _____________ –Mixing metalloids with other chemicals can…

How is the modern periodic table arranged? What are the three classes of elements? What are two elements that have the same properties as Magnesium? Review