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Chapter 12 Section 1 Arranging the Elements. The Periodic Table Crash Course --- The Periodic Table. Why arrange the elements?. Read page 336 Why would grouping elements by their properties help scientist? So they could understand how the elements interact with one another.

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Chapter 12 section 1 arranging the elements

Chapter 12Section 1Arranging the Elements

The Periodic Table

Crash Course --- The Periodic Table


Why arrange the elements
Why arrange the elements?

  • Read page 336

  • Why would grouping elements by their properties help scientist?

  • So they could understand how the elements interact with one another.

  • What helped Mendeleev see the pattern of the elements?

  • He arranged them in order of increasing atomic mass


Read p 337
Read p.337

  • What was seen when Mendeleev arranged the elements in order of increasing mass?

  • He saw a repeating pattern

  • What is the name of something that occurs or repeats at regular intervals?

  • Periodic

  • Who worked with the atomic number (number of protons) in atoms

  • Henry Moseley



Decoding the periodic table
Decoding the periodic table

  • Read p.342

  • What does a chemical symbol do?

  • Identify the element

  • How are chemical symbols written?

  • With a capital letter and a lower case letter for the second letter if needed

  • New elements are written how?

  • With temporary 3 letter symbols


Periods
Periods

  • What is a period in chemistry?

  • A horizontal row of elements in the periodic table

  • The physical and chemical properties in these rows follow what type of pattern?

  • repeating


Columns
Columns

  • What is a group?

  • A vertical column of elements in the periodic table; elements in a group share chemical properties

  • Why is a group sometimes called a family?

  • Often, they have similar chemical and physical properties

  • Bozerman Science --- A Tour of the Periodic Table


Exit slip
Exit Slip

  • On a slip of paper, answer the following questions:

  • 1. How are the elements arranged in the modern periodic table?

  • 2. A horizontal row of elements in the periodic table.

  • 3. A column of elements is known as a family or a __________.


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