# Chapter 12 Section 1 Arranging the Elements - PowerPoint PPT Presentation

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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

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## Chapter 12Section 1Arranging the Elements

The Periodic Table

Crash Course --- The Periodic Table

### Why arrange the elements?

• 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

• 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

• 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

• 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

• 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

• 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 __________.