Ch. 5: Periodic Table

[Pages:64]Ch. 5: Periodic

Table

C. Goodman, Doral Academy Preparatory High School, 2011-2013

Essential Question: Section 5.1

1. What is the history of the development of the Periodic Table? 2. What is the periodic law, and how can it be used to predict

physical and chemical properties of elements? 3. What is the overall organization of the modern Periodic Table?

1. Three types of elements 2. Named groups 3. Other families

Section 5.1 Vocabulary

? Mendeleev ? Moseley ? Periodic Law ? Period ? Group ? Main group elements

Periodic Table - Definition

Periodic Table -- an arrangement of the elements in order of their atomic numbers so that elements with the same chemical properties are in the same group (family). Examples: halogens, noble gases, alkali metals.

Why is it cool?

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History of the Periodic Table I

? Mendeleev: 1869

? Atomic mass ? Repeating (periodic)

patterns of reactivity

?In his favor: predicted the discovery of Gallium, which was isolated in his lifetime ?Certain characteristic properties of elements can be foretold from their atomic weights ?Problem: Iodine and Tellurium

History of the Periodic Table II

Moseley: 1914

Atomic number each element has a unique atomic number; resequenced the table by electronic charge (=atomic #) rather than atomic weight.

Periodic Law

?In his favor: solved the "Iodine and Tellurium" problem

Moseley's Periodic Law - Definition

? Periodic Law The physical and chemical properties of the elements are periodic functions of their atomic numbers.

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