1-2 organizing the elements

ORGANIZING THE ELEMENTS

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ORGANIZING THE ELEMENTS

ORGANIZING ELEMENTS BY THEIR PROPERTIES Periodic table- organizes information

about the elements and their properties Atomic mass- the average mass of one

atom of an element Mendeleev discovered that he could

arrange the elements in a chart, or table, based on their physical and chemical properties

HOW WAS MENDELEEV'S SYSTEM FOR ORGANIZING THE ELEMENTS SHOWN TO BE RELIABLE?

TODAY’S PERIODIC TABLE Information in periodic table

based on structure of atoms Elements are grouped in the

periodic table according to their properties

Atomic parts- protons, neutrons, and electrons

Atomic number- the number of protons in the nucleus of its atoms

NAVIGATING THE TABLE Group- elements in the same column, or

family Elements in the same group have similar

physical and chemical properties Period- row across the table

IDENTIFYING PATTERNS AND PROPERTIESYou can classify an element and predict some of its physical and chemical properties based on the element’s location in the periodic table.

Metals Nonmetals

Metalloids• Elements to

the left of the line are metals

• Elements to the right of the line are nonmetals

• Have properties sometimes similar to metals and other time to nonmetals

THE PERIODIC TABLE Chapter 6. ORGANIZING THE ELEMENTS Section 1

Slide 1 of 28 Organizing the Elements 6.1. Slide 2 of 28 © Copyright Pearson Prentice Hall Organizing the Elements > Searching For an Organizing Principle

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Organizing the Elements Metals Nonmetals and Metalloids

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Organizing the Elements. Patterns in the Elements By 1869, a total of 63 elements had been discovered. These elements had a wide variety of properties