1. 15 Families of Elements

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3. 15 Families of Elements Key Vocabulary atom atomic mass element family (of elements) metal Periodic Table of the Elements

4. 15 Families of Elements What do you understand when you hear the word element? From the materials tested in Activity 14, “Physical and Chemical Properties of Materials,” which do you think were elements? Record your answer in your notebook.

5. 15 Families of Elements Read the introduction and look for key ideas The element Mercury on the periodic table.

6. 15 Families of Elements Element A substance that cannot be broken down into simpler substances by heating it or causing it to react with other chemicals is called an element.

7. 15 Families of Elements How can elements be grouped based on their physical and chemical properties? The element Silicon on the periodic table.

8. 15 Families of Elements Element cards

9. 15 Families of Elements Complete procedure steps 1-4

10. 15 Families of Elements Procedure step 5 Present your classification system to the class. As you look at other students’ systems, observe similarities and differences between theirs and yours. Discuss your observations with your group.

11. 15 Families of Elements Complete procedure steps 6-9 Record your new classification system in your notebook.

12. 15 Families of Elements The element cards show only 14 of more than 100 known elements

13. 15 Families of Elements Compare your sorts with the Periodic Table of Elements What are the similarities between your sorts and the accepted convention of sorting the elements shown in the Periodic Table? Share your answer with the class.

14. 15 Families of Elements Analysis question 1 Which of the properties listed on the Element Cards are: a.physical properties? b.chemical properties?

15. 15 Families of Elements Analysis question 2 How did your first classification system compare to the second classification with the Element Cards?

16. 15 Families of Elements Analysis question 3 In what ways could grouping elements help scientists understand their properties?

17. 15 Families of Elements Analysis question 4 Use the table of elements you constructed to find the group or groups of elements that are: a.not usually reactive. b.highly reactive c.all metals. d.all solids. e.all gases.

18. 15 Families of Elements Analysis question 5 The element strontium (Sr) is below calcium (Ca) in Column 2 on the periodic table. Design an Element Card that shows the properties you predict for strontium.

19. 15 Families of Elements SCORING GUIDE: Understanding Concepts

20. 15 Families of Elements How can elements be grouped based on their physical and chemical properties? The element Silicon on the periodic table.

21. 15 Families of Elements Key vocabulary definitions Atom - The basic structural unit of an element. Atomic mass - The average mass of atoms of an element; also known as atomic weight. Element - A substance that cannot be broken down into simpler substances by chemical or physical means.

22. 15 Families of Elements Key vocabulary definitions Family (of elements) - Elements with similar chemical properties arranged in the same column of the periodic table. Metal - Category of elements that usually have a shiny surface, are generally good conductors of heat and electricity, and can be melted or fused, hammered into thin sheets, or drawn into wires.

23. 15 Families of Elements Key vocabulary definitions Periodic Table of the Elements - An arrangement of the elements in which elements are ordered by atomic number (number of protons) so that similar elements are arranged in columns.

24. 15 Families of Elements To view links to different versions of the periodic table and the latest update on the number of elements, visit the SEPUP website: www.sepuplhs.org