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Chapter 12 Section 1 Arranging the Elements

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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  1. Chapter 12Section 1Arranging the Elements The Periodic Table Crash Course --- The Periodic Table

  2. 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

  3. 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

  4. Properties p.340-341

  5. 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

  6. 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

  7. 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

  8. 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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